Orbitelariae 
Orhitelariae (6r-bit-e-la'ri-), . pi. [NL. 
(Thorell, 1869), < L. orbis, a circle, orb, + tehi, 
a web: see toil 2 .] A superfamily of spiders, 
comprising all those forms which spin orb- 
shaped webs. At present the families Epeiridce, Ulo- 
boridai, and Tetragnathidce are the only ones included. 
It is a natural group, the structural characters showing 
great uniformity. A few genera, however, are included 
here on account of structural features, which do not spin 
orb-webs. See Pacltygnatha._ 
orbitelarian (6r"bi-te-la'ri-an), a. and >i. [< 
orbitele + -arian.] I. a. Orbitelar. 
II. n. An orbitele. 
orbitele (or'bi-tel), . [< NL. OrUtehe, a vari- 
ant of Orbitelarite.] A spinning-spider of the 
division Orbitelarice, as an epeirid or garden- 
spider; an orb- weaver. 
orbitelous (6r-bi-te'lus), a. [< orbitele + -ous.] 
Orbitelar. 
orbitoidal (6r-bi-toi'dal), a. [< L. orbita, orbit, 
+ Gr. eMof, form, + -al] Orbital in form; or- 
biculate Orbitoidal limestone, a member of the 
Vicksburg group ; a limestone characterized by the pres- 
ence of the fossil foraminifer Orbitcrides mantetti. 
orbitoline (6r-bit'o-lin), a. [As Orlntol(ites) + 
-ine 1 .] Of or pertaining to the foraminiferous 
genus Orbitolites. 
orbitolite (6r-bit'o-lit), . [< NL. Orbitolites.] 
1. A foraminifer of the genus Orbitolites. En- 
cyc. Brit., XIX. 849. 2. A fossil coral of the 
genus Orbitolites (def. 2). 
Orbitolites (6r-bi-tol'i-tez), n, [NL., < L. orbi- 
ta, orbit, + Gr. Wof, a stone (accom. to suffix 
-ites).] 1. A genus of fossil milioline foramini- 
fers, having the inner chamberlets spirally ar- 
ranged, and the outer ones cyclically disposed. 
Lamarck, 1801. 2. A genus of corals of the 
family Orbitolitido} : a synonym of Chaitites. 
Eichwald, 1829. 
orbitonasal (6r"bi-to-na'zal), a. [< L. orbita, 
orbit, + nasus, nose: see nasal.'] Pertaining 
to the orbit of the eye and to the nose. 
orbitopineal (6r"bi-t6-pin'e-al), a. [< L. orbita, 
orbit, + NL. pinea, pineal : see pineal."] Per- 
taining to the orbit of the eye and to the pineal 
body: as, an "orbitopineal process or nerve," 
Amer. Nat, XXII. 917. 
orbitorostral (6r"bi-t6-ros'tral), a. [< L. orbi- 
ta, orbit, + rostrum, beak: see rostral.] Per- 
taining to the orbit and to the rostrum ; com- 
posing orbital and rostral parts of the skull. 
orbitosphenoid (6r"bi-t6-sfe'noid), a. and n. 
[< L. orbita, orbit, + E. sphenoid.] I. a. Or- 
bital and sphenoidal; forming a part of the 
sphenoid bone in relation with the orbit of the 
eye. 
II. n. In anat., a bone of the third cranial 
segment of the skull, morphologically situated 
between the presphenpid and the frontal, and 
separated from the alisphenoid by the orbital 
nerves, especially the first division of the fifth 
nerve. It is commonly united with other sphenoidal 
elements ; in man it constitutes the lesser wing of the 
sphenoid, or process of Ingrassias, and bounds the sphe- 
noidal fissure in front, forming a part of the bony orbit of 
the eye. See cuts under Crocodtiia, GaUinat, orbit, skull, 
and sphenoid. 
orbitosphenoidal (6r"bi-to-sfe-noi'dal), a. [< 
orbitosphenoid + -al.] Same as orbitosphenoid. 
orbitualt (6r-bit'u-al), a. [Improp. for orbital.] 
Same as orbital. 
orbituary (6r-bit'u-a-ri), a. [Improp. for or- 
bitary.] Of or pertaining to an orbit ; orbital. 
[Rare.] Imp. Diet. 
orbitudet (6r'bi-tud), n. [< L. orbitudo, be- 
reavement, < orbits, bereaved: see orb 2 .] Be- 
reavement by loss of children or of parents. 
Bp. Hall. 
orbityt (6r'bi-ti), n. [< OF. orbete, < L. orbi- 
ta(t-)s, bereavement, ? orbus, bereaved: see 
orb 2 .] Same as orbitude. 
When God Is pleased . . to give children, we know the 
misery and desolation of orbity, when parents are deprived 
ot those children by death. Donne, Sermons, xx. 
orb-like (orb'lik), a. Resembling an orb. Imp. 
Diet. 
orb-weaver (6rb'we"ver), . Any spider of 
the large group Orbitelai: distinguished from 
tube-weaver, tunnel-weaver, etc. 
The studies are particularly directed to the spinning 
habits of the great group of spiders known as orb weavers. 
Science, XIV. 130. 
orby (dr'bi), a. [< or&l + -/!.] 1. Resembling 
or having the properties of an orb or disk. 
Then Paris first with his long javeline parts ; 
It smote Atrides orbie targe, but ranne not through the 
brasse. Chapman, Iliad. 
Now I begin to feel thine [the moon's] orby power 
Is coming fresh upon me. Keats, Endymion, iii. 
2. Revolving as an orb. 
4140 
When now arraid 
The world was with the Spring, and orbie houres 
Had gone the round againe through herbs and flowers. 
Chapman, Odyssey, x. 
orct, ork 1 ! (ork), . [Also, erroneously, orcli ; < 
L. orca, a kind of whale.] A marine mammal; 
some cetacean, perhaps a grampus or killer, or 
the narwhal. See Orca 1 . 
Now turn and view the wonders of the deep, 
Where Proteus' herds and Neptune's orks do keep. 
B. Jonson, Neptune's Triumph. 
An island salt and bare, 
The haunt of seals, and ores, and sea-mews' clang. 
Milton, P. L., xi. 885. 
I call him mite, because I know no beast 
Nor fish from whence comparison to take. 
Sir J. Harinyton, tr. of Ariosto's Orlando Furioso, x. 87. 
There are two varieties of the Delphinus orca, the ore 
and the grampus. . . . The ore is about eighteen or twenty 
feet long. Cmier, Eegne Animal (trans. 1827), IV. 455. 
Orca 1 (or'ka), n. [NL., < L. orca, a kind of 
whale: see ore.] In mammal., a genus of ma- 
rine delphinoid odontocete cetaceans, contain- 
ing the numerous species known as killers, 
stuord-fish, or grampuses. They are remarkable for 
their strength, ferocity, and predatory habits, and are the 
only cetaceans which habitually prey upon warm-blooded 
animals, such as those of their own order. The teeth are 
about 48 in number, implanted all along the jaws ; the ver- 
tebrse are 50-52, of which the cervicals are mostly free; 
the flippers are very large, and oval ; the dorsal fin is high, 
erect, pointed, and situated about the middle of the body ; 
and the head is obtusely rounded. 
orca 2 (Sr'ka), w. [NL., < L. area, a butt, tun, a 
dice-box ; a transferred use of orca, a kind of 
whale: see ore.] In ornith., that part of the 
tracheal tympanum of a bird which is formed by 
the more or less coossified rings of the bronchi. 
See tympanum. Montagu. 
Orcadian (6r-ka'di-an), a. and n. [< L. Orcades 
(see def.) + -ian.] " I. a. Relating to the Or- 
cades, or Orkney Islands, in Scotland. 
II. n. A native or an inhabitant of Orkney. 
orcanet, orchanet (6r'ka-net), n. [< OF. or- 
eanette, orehanette, F. orcanete : see alkanet.] A 
plant, Alkanna tinctoria : same as alkanet, 2. 
orcein (6r'se-in), n. [< orc(ine) + -e- + -in 2 .] 
A nitrogenous compound (C 7 H 7 NO 3 ) formed 
from orcine and ammonia. It is a deep-red powder 
of strong tinctorial power, and when dissolved in ammo- 
nia is the basis of the archil of commerce. See orcine. 
orcht, n. An erroneous form of ore. 
orchalt, . An obsolete variant of archil. 
orchard (or'chard), n. [Formerly also some- 
times orchat (simulating Gr. opxarof, a garden, 
orchard) ; < ME. orchard, orcherd, orcheyerd, 
orchegard, etc., < AS. orcerd, orcyrd, orcird, ort- 
geard, orcgeard, ordgeard (= Icel. jurtagardhr = 
Sw. ortagard = Dan. urtegaard = Goth, aurti- 
gards), a garden, orchard; < art-, appar. a re- 
duced form of wyrt, herb, + geard, yard (cf. 
wyrtgeard, a garden, in which the full form wyrt 
appears) : see worfl and yard 2 . The lit. sense 
' herb-garden ' appears also in arbor 2 , ult. < L. 
herba, herb.] If. A garden. 
And therby is Salomon's orcheyerd, whiche is yet a right 
delectable place. Sir S. Qvylforde, Pylgrymage, p. 39. 
For further I could say "This man 's untrue," 
And knew the patterns of his foul beguiling; 
Heard where his plants in others' orchards grew ; 
Saw how deceits were gilded in his smiling. 
Shak., Lover's Complaint, 1. 171. 
2. A piece of ground, usually inclosed, de- 
voted to the culture of fruit-trees, especially the 
apple, the pear, the peach, the plum, and the 
cherry ; a collection of cultivated fruit-trees. 
Thy plants are an orchard of pomegranates, with pleas- 
ant fruits. Cant. iv. 13. 
You shall see my orchard, where, in an arbour, we will 
eat a last year's pippin of my own grading, with a dish of 
caraways, and so forth. Shak., 2 Hen. IV., v. 3. 1. 
Two lovers whispering by an orchard wall. 
Tennyson, Circumstance. 
orchard-clam (6r' chard -klam), n. A round 
hard clam or quahaug, Venus mercenaria. TLo- 
cal, U. S.] 
orchard-grass (6r'chard-gras), n. A tall-grow- 
ing meadow-grass, Dactylis glomerata. See 
cocksfoot and Dactylis, and cut in next column. 
orchard-house (6r'chard-hous), n. A glass 
house for the cultivation of fruits too delicate 
to be grown in the open air, or for bringing 
fruits to greater perfection than when grown 
outside, without the aid of artificial heat. 
orcharding (or' char -ding), n. [< orchard + 
-ingl.] The cultivation of orchards. 
Trench grounds for orcharding, and the kitchen-garden 
to lie for a winter mellowing. 
Evelyn, Calendaiium Hortense, October. 
orchardist (or'char-dist), n. [< orchard + -ist.] 
One who cultivates fruit in orchards: as, an 
experienced orchardist. 
Orchard-grass ( Dactylis ^ 
i, the panicle ; 2, the lower part of the 
plant ; a, a spikelet : b, the empty glumes ; 
c, the lower flowering glume ; d, the palet. 
orchestra 
orchard-oriole 
(6r-chard-6'ri- 
ol), n. " A bird, 
Icterus spurius, of 
the family Icteri- 
dee, which sus- 
pends its neatly 
woven nest from 
the boughs of 
fruit, shade, and 
ornam e n t a 1 
trees. It is one 
of the hangnests or 
American orioles, a 
near relative of the 
Baltimore oriole, and 
is sometimes called 
bastard Baltimore. 
It is very common in 
the United States in 
summer. The male 
is seven inches long 
and ten inches in 
spread of wings ; the 
plumage is entirely 
black and chestnut; 
the female is some- 
what smaller, and 
plain olive and yellowish. The young male at first re- 
sembles the female, and during the progress to the per- 
fect plumage shows every gradation between the colors 
of the two sexes. 
orchatt, n. See orchard. Milton ; J. Philips, 
Cider, i. 
orchelt, orchellat (or'kel, 6r-kel'a), . Same 
as orchil, archil. 
orchella-weed (6r-kel'a-wed), . Same as ar- 
chil, 2. 
orcherdt, An obsolete form of orchard. 
orch.es, n. Plural of orchis^. 
orchesis (6r-ke'sis), n. [< Gr. !>px'/o<f, dancing, 
a dance, < bpxeiaBai, dance: see orchestra.] The 
art of dancing or rhythmical movement of the 
body, especially as practised by the chorus in 
the ancient Greek theater ; orchestic. 
orchesography (6r-ke-sog'ra-fi), n. [Prop. *or- 
chesiography, < Gr. dpxqav, dancing, a dance, + 
-ypaijiia, \ ypafyciv, write.] The theory of dan- 
cing, especially as taught in regular treatises 
illustrated by drawings. 
orchestert, n- An obsolete form of orchestra. 
Orchestia (6r-kes'ti-a), n. [NL.,< Gr. b 
leap.] Agenusof 
amphipods, typ- 
ical of the family 
Orchestiida?. 
orchestic (6r- 
kes'tik), a. and 
n. [= F. orches- 
tique = Pg. or- 
chestico, < Gr. bpxrjaTiKot;, pertaining to dancing, 
< bpxelaSat, dance: see orchestra.'] I. a. Of or 
pertaining to dancing or the art of rhythmical 
movement of the body; regulating or regulated 
by dancing: as, the orchestic arts. 
Poetic rhythm, as well as orchestic and musical rhythm. 
Trans. Amer. Fhilol. Ass., XVI. 78. 
II. H. The art of dancing; especially, among 
the ancient Greeks, the art which uses the 
rhythmical movements of the human body as a 
means of scenic expression: also used in the 
plural with the same meaning as in the singu- 
lar. 
The silent art of orchestic has its arses and theses, its 
trochees and iambi, its dactyls and anapaests, not less truly 
than music and poetry. J. Hadley, Essays, p. 81. 
Orchestiidae (6r-kes-ti'i-de), . pi. [NL., < Or- 
chestia + -Ma?.] A family of gammarine amphi- 
pod crustaceans, typified by the gemisOrchestia. 
They have the upper antennae snorter than the lower, the 
COXBS well developed, and the posterior pleopods short and 
robust, the last being single. Ihe species are inhabitants 
of the littoral region, and some are known as beach-fleas. 
Also OrchestiadtK, Orchestidai. 
orchestra (or'kes-tra), M. [Formerly orchester, 
orchestre; < F. orchesire = Sp.orquesta, orquestra 
= Pg. It. orchestra (cf. L. orchestra, the place 
where the senate sat in the theater, also the 
senate itself, prop, the orchestra)/ Gr. bpxi/arpa, 
a part of the stage where the chorus danced, 
the orchestra, < opxeiaOat, dance.] 1. The part 
of a theater or other public place appropriated 
to the musicians, (a) In theaters, in classic times, the 
orchestra was a circular or semicircular level space lying 
between the rising tiers of seats of the auditorium and the 
stage. In Greek theaters this space was circular, and was 
allotted to the chorus, which performed its evolutions 
about the thymele or altar of Dionysus, which occupied 
the center of the orchestra. Among the Romans the or- 
chestra corresponded nearly to the orchestra of modern 
play-houses, and was set apart for the seats of senators 
and other persons of distinction. See diagram under dia- 
anna, (b) In a modern theater or opera-house, the place 
