OATMEAL 



240 



ODONTOPHORA 



for horses. Animal O.^Avena sterilis: the 

 fruit of which moves about the ground 

 owing to the twisting and untwisting of its 

 awns as the air becomes more or less damp. 

 0. grass = A vena. 



Oatmeal. The ground grains of oats. 



Obelisk, (ob'e-lisk). [Obeliskos, the Greek 

 word.] A four-sided stone pillar, usually 

 monolithic, tapering upwards. 



Oberon, (6'be-ron). A satellite of Uranus. 



Object glass. The lens in a microscope or a 

 telescope which is nearest to the object 

 viewed. 



Oblate, (ob-laf). [Oblatum, the Latin word.] 

 Spheroidal: orange-shaped; having the form 

 of a sphere, flattened slightly at the ex- 

 tremities of one diameter. 



Oblique, (ob-lek'). [Obliquus, the Latin word.] 

 Not parallel, nor perpendicular: slanting. 

 0. crystals: with one axis perpendicular to 

 each of the others. 



Obliquity, (ob-lik'wi-ti). [Oblique, q.v.] 

 Deviation from parallelism, or from being 

 at right angles. 0. of ecliptic: the inclination 

 of the equator and ecliptic. 



Oblong, (ob'long). [Oblongus, the Latin word.] 

 1. Rectangle, q.v. 2. = Rectangular, q.v. 



Oboe, (6'boi). [Ilautbois, the French name.] 

 =Hautboy: a reed musical instrument. 



Observatory, (ob-zer'va-to-ri). [L. observe, I 

 note.] A place adapted for the observation 

 of astronomical and other phenomena. 



Obsidian, (ob-sid'i-an). [Opsianos, the Greek 

 name.] = Volcanic glass = Fused Trachytic 

 rock: a variety of amorphous felspar. 



Obtected, (ob-tek'ted). [L. obtexo, I cover.] 

 Covered: especially used of animals covered 

 with a hard shelly case. 



Obtuse, (ob-tus'). [L. obtusus, blunt.] Blunt 

 or rounded: the opposite of acute. 0. angle: 

 one that is greater than a right angle. 



Occipital, (ok-sip'it-al) = Epencephalic : be- 

 longing to the back of the cranium. 0. con- 

 dyles : connect the skull with the atlas ver- 

 tebrae. 0. foramen: an opening in the 

 lower back part of the skull. 



Occluded, (ok-klu'ded). [L. occlusio, I shut.] 

 Enclosed: shut in. 



Occultation, (ok-kul-ta/shun). [L. occultus, 

 hidden. ]=Eclipse: used of the eclipse of 

 stars by the moon. 



Ocean, (o'shuri). [Oceanus, the Latin word.] 

 Sea: the general contour of the ocean has 

 been the same as now since the Silurian 

 epoch. Oceans are generally areas of sub- 

 sidence. 



Ocelli, (o-selli). 

 [L. ocellus, little 

 eye.] Simple eyes 

 =Stemmata, q.v. 



Ocelot, (6'se-lot). 

 [ The Mexican, 

 name. ] = Felis: 

 pardalis : a cat- 

 like animal. 



Ochnacese, (ok-na/ 

 se-e). [Gk.ochne, 

 pear.]=Ochnads: 

 tropical trees and ocelot. 



shrubs belonging to Rutales, named from the 

 leaves. 



Ochre, (S'kr). [Gk. ochros, yellow.] A general 

 name for a number of oxidised metallic ores, 

 some of which are used as pigments. 



Octagon, (ok'ta-gon). [Gk. okto, 

 eight; gonia, angle.] A plane 

 figure formed by eight sides. 



Octahedron, (ok-ta-hed'ron). [Gk. | 

 okto, eight; hedra, seat.] A solid 

 formed by the intersection of 

 eight planes; in a regular octa- Octagon. 

 hedron the faces are all equilateral triangles. 



Octave, (ok'tav). [L. octavus, eighth. J= 

 Eighth, q.v. 



Octane, (ok'tan). [L. octo, eight.] v. Hydro- 

 carbons, 1st series. 



Octopoda, (ok-to'po-da). [Octopus, q.v.] 

 Cuttle-fishes, with not more than 8 arms: 

 a sub-division of Dibranchiata, q.v. 



Octopodidae, (ok-tS-pod'i-de). [Octopus, q.v.] 

 =Poulpes: cuttle-fish, argonaut, &c. ; cepha- 

 lopodous mollusca. 1. A sub-division of 

 Octopoda. 2. Octopoda. 



Octopus, (ok-to'pus). [Gk. okto, eight; pous, 

 foot. ]= Eight-armed cuttle-fish: the type of 

 Octopoda. 



Octyl, (ok'til). [Gk. oUo, eight; hyle. 

 material.] C 8 H 17 . The radicle of the Octylic 

 series. 0. aco/<o=Castor oil. 



Octylamine, (ok-til'a-min). [Octyl and Amine, 

 q.v. ]=C8Hi 6 Caprylamine:aliquid obtained 

 from Octylic alcohol. 



Octylene, (ok'til-gn). [Octyl, g.w.]=C 8 H 16 =: 

 Caprylene: a liquid hydrocarbon of the 

 olefine series. 



Octylia, (ok-til'i-a). [Octyl, <7.v.]=C 8 H]<)No 

 Caprylia: a base from octyl alcohol or castor 

 oil. 



Octylic, (ok-til'ik). [Octyl, q.v.] Related to 

 the base octylia. 



Ocymum, (6'si-mum). [The Latin name.] 

 Basil : a fragrant plant belonging to 

 Lamiaceae. 



Ocypoda, (o-sip'o-da). [Gk. ochys, swift; pous, 

 foot.] 1. Sand-crab: belonging to Brachyura, 

 2, A beetle: belonging to Brachelytra. 



Ocypterus, (6-sip'ter-us). [Gk. ochys, swift; 

 pteryx, wing.] Swallow-shrike: a bird be- 

 longing to Laniadfe; also called the swift- 

 shrike. 



Odling's system of notation. Monads are ex- 

 pressed by i, as IF, dyads by ii, as O, 

 triads by iii, as N ui , teti-ads by iv, as C iv , <fec. 



Odometer, (o-dom'e-ter). [Gk. hodos, road ; 

 metron, measure.] An apparatus for 

 measuring the distance travelled by a 

 vehicle. 



Odontaspis, (o-don-tas'pis). [Gk. odous, tooth: 

 aspis, shield.] A shark, known only by fossil 

 teeth, found in Eocene rocks. 



Odontography, (o-don-tog'ra-fi). [Gk. odous, 

 tooth; grapho, I write.] The description of 

 teeth. 



Odontoid process, (o-don'toid). [Gk. odous, 

 tooth; eidos, form.] A bony projection of 

 the second vertebra, upon which the head 

 turns. 



Odontophora, (o-don-tofo-ra). [Odontophore, 



