Part 163

OLFAC´TORY, a. Pertaining to the sense of smell.

OLIGOMY´OID, a. Having few or imperfect syringeal muscles among Passeres.

OLIGOTO´KOUS, a. Producing few young.

OLIVA´CEOUS, a. Of a mixed green and brown color.

OMNIV´OROUS, a. Eating anything; feeding indiscriminately.

O´MOPLATE, n. Shoulder-blade. (Omo-, in composition, is a prefix referring to the shoulder.)

OM´PHALOS, n. Same as umbilicus, navel.

OÖLOG´ICAL, a. Pertaining to oölogy.

OÖL´OGY, n. Science of birds’ eggs.

OPER´CULUM, n. Lid or cover; flap. The nasal scale, or roofing of the external nostrils, is the operculum naris.

OPHTHAL´MIC, a. Pertaining to the eye. Ophthalmic region is equivalent to orbital region.

OP´TIC, a. Pertaining to the eye, or to the sight. The optic nerve issues from the brain and spreads into the retina.

O´RAL, a. Pertaining to the mouth.

ORBIC´ULAR, a. Circular.

OR´BIT, n. Eye-socket. Also, synonymous with orbita.

OR´BITA, n. Circumorbital region taken immediately around the eye-opening. (41.)

OR´BITAL, a. Pertaining to the orbit.

ORBI´TO-SPHE´NOID, n. Part of the sphenoid bone, forming a portion of the orbit.

OR´DER, OR´DO, n. In classification, a group pl. ordines, between family and class.

OR´DINAL, a. Having the taxonomic rank or value of an order.

OR´GAN, n. Any individual part, or system of parts, of the body having a specific physiological function, considered with reference to its action, processes, or results. Eye, organ of sight; wing, organ of flight; stomach, liver, organs of digestion; muscles collectively, organs of locomotion.

OR´GANISM, n. Any living body capable of separate existence.

OR´GASM, n. Immoderate excitement; said chiefly of sexual excitement, of which the orgasm is the height. Erethism.

ORNITH´IC, a. Pertaining to birds.

ORNITHOCOP´ROLITE, n. Fossil bird-dung.

ORNITHOL´OGY, n. Science of birds.

ORNITHOT´OMY, n. Anatomy of birds.

OS, n.; gen. oris; pl. ora. Mouth. Cavum oris, cavity of the mouth.