Part 172

RAU´COUS, a. Hoarse-voiced.

REC´TRIX, n.; pl. rectrices. Quills of the tail. (70.) (The singular is little used.)

REC´TUM, n. Lower straight gut.

REC´TUS, a. Name of certain muscles.

RECURVED´, a. Bent regularly and gradually upward.

REFLECT´ED, a. Turned backward.

REFLEC´TION, n. Play of color changing in different lights.

REG´IMEN, n. Diet.

RE´GIO, RE´GION, n. Portion of the body in any way distinguished; dorsal region; cervical region.

RE´MEX, n.; pl. remiges. Quill of the wing. (75, 76.) (Little used in the singular.)

RE´NAL, a. Pertaining to the kidneys.

RE´TE, n. Same as plexus.

RETIC´ULATE, a. Marked with network of lines.

RETICULA´TION, n. Network; mosaic.

RET´INA, n. Expansion of the optic nerve within the eye, upon which images of objects are impressed.

RETRAC´TILE, a. Susceptible of being drawn back and driven forward as a hawk’s claw.

RETRORSE´, a. Directed backward.

RHACH´IS, n.; pl. rhachides. Scapus exclusive of calamus; shaft of a feather, bearing the webs, without the hollow horny barrel. (146.) Also, the spinal column.

RHAMPHOTHE´CA, n. Covering of the whole bill. (12.)

RHI´NAL, a. Pertaining to the nose.

RHINENCEPH´ALON, n. Foremost tract of the brain, the fourth from behind.

RHINOTHE´CA, n. Covering of the upper mandible. (13.)

RHIZONYCH´IUM, n. Terminal bone of a toe bearing a claw. (122.) (Little used.)

RHOM´BOID, a. Lozenge-shaped. Name of a muscle of the shoulder-blade.

RIC´TUS, n. Gape of the mouth.

RIDGE, n. CULMEN (which see). (20.)

RI´MA, n. Outline of a slit-like opening.

RI´MA GLOT´TIDIS, n. Opening of the glottis.