Umbili´cus, n. Navel. Pitted scar, indicating point of entrance of placental vessels into the fœtus. Also, any similar pit or depression, as that on the scape of a feather at junction of rhachis and calamus.
Unarmed Toe. Toe bearing no claw. See Digitus Muticus. (133.)
Un´ciform, a. Hooked.
Under Jaw. See Mandibulum.
Under Parts. See Gastræum.
Under Tail-coverts. (13.) See Crissum.
Under Wing-coverts. (84.) See Tectrices.
Undula´tion, n. Wavy color-marks.
Unguic´ulate, a. Clawed.
Unguis, n.; pl. ungues. Claw.