ORA 



292 



ORG 



ora serrata, or'-a sVr-rata (L. ord, 

 extremity, border ; serrdtus, 

 saw-shaped, serrated), in anat., 

 the finely indented border which 

 terminates the outer edge of the 

 ciliary processes of the choroid. 



orbicular, a., drb-ik'ul-dr (L. 

 orblculus, a small disk from 

 orbis, a circle, a ring), in bot., 

 having a rounded leaf with a 

 petiole attached to the centre of 

 it ; made in the form of an orb ; 

 completely circular. 



orbicularis oris, tirb-ik'ul-dr'-fa 

 or'-is (L. orbiculdris, circular 

 from orbis, a circle ; 6s, a mouth, 

 oris, of a mouth), the circular 

 muscle of the mouth ; in anat., 

 a sphincter muscle, elliptic in 

 form, composed of concentric 

 fibres, which surround the 

 orifice of the mouth : orbicularis 

 palpebrarum, pdlp^b-rdr'-um (L. 

 palpebra, an eyelid, palpeb- 

 rdrum, of eyelids), the sphincter 

 of the eyelids : o. urethras, ur-eth'- 

 re (mod. L. urethra, the urethra, 

 urethrce, of the urethra from Gr. 

 ouron, urine), the sphincter of 

 the urethra. 



Orbiculus, n., orlW-ul-us (L. 

 orUculus, a small disk from 

 orbis, a circle), in bot., one of 

 the circular bodies found in the 

 cups of Nidularia, a genus of 

 Fungi. 



orbit, n., Vrb'-it (L. orbita, a 

 track, a path from orbis, a 

 circle), one of the two cavities 

 in the skull containing the 

 eyeballs : orbital, a., drb'-tt-al, 

 pert, to the orbits. 



Orchidaceaa, n. plu., orW4d>af'Se>e, 

 or Orchids, n. plu. , orWidz (L. and 

 Gr. orchis, a plant with roots in 

 the form of testicles ; Gr. orchis, 

 a testicle), the Orchis family, an 

 extensive Order of plants, dis- 

 tinguished by the peculiar forms 

 of their flowers, etc., the flowers 

 often resembling various insects, 

 birds, and reptiles ; many of the 

 species possess mucilaginous prop- 



erties, some are aromatic, and 

 others antispasmodic and tonic : 

 Orchis, n., drk'-is, a genus of 

 these plants : Orchis mascula, 

 rndsk'-ul-cL (L. masculus, male) ; 

 0. papilionacea, pdp-U^-on-d- 

 se-d (L. pdpilid, a butterfly, 

 pdpilwnis, of a butterfly) ; 0. 

 mcrio, mor'i-d (L. morio, a 

 dark-brown gem) ; 0. militaris, 

 mil'-it-dr'-is (L. mllitdris, soldier- 

 like from miles, a soldier) ; 0. 

 coriophora, kor^-df-dr-d (Gr. 

 Tctiridn, a coriander ; phoreo, I 

 bear) ; 0. longicruris, lonj'4- 

 krdr'is (L. longicruris, of the 

 long leg from longus, long, 

 longi, of long ; crus, a leg, 

 cruris, of a leg), are species 

 which yield Salep, an article of 

 diet for convalescents ; the * 0. 

 mascula ' is supposed to be the 

 ' long purples ' of Shakespeare. 



orchitis, n., tirk-it'-is (Gr. orchis, 

 a testicle), inflammation of the 

 testicle. 



Order, n., Srd'er, a division of 

 animals or plants above a Genus 

 and below a Class ; a collection 

 or assemblage of Genera ; see 

 ' Genus. ' 



Oreodaphne, n., dr'.e-6-ddf'ne (Gr. 

 oros, a mountain ; daphne, the 

 laurel), a genus of plants, Ord. 

 Lauracess : Oreodaphne opifera, 

 dp'?f>er'd (L. opifer, aid-bringing 

 from ops, aid, power ; fero, I 

 bear), a species whose inner bark 

 yields a large quantity of volatile 

 oil. 



organ, n., org'-an (L. organum, 

 Gr. organon, an instrument), in 

 anat., a part of the living body 

 by which some action, operation, 

 or function is carried on ; in bot. , 

 any defined subordinate part of a 

 vegetable structure, as a cell, a 

 fibre, a leaf, a root, etc. : organic, 

 a., drg-dn'-ik, also organical, a., 

 tirg-dn'ik-dl, pert, to or produced 

 by living organs : inorganic, a., 

 pert, to bodies without specific 

 organs ; dead matter : organism, 



