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.)