Incuba´tion, n. Act of setting on eggs to hatch them.
Incum´bent, a. Depressed or bending down upon something; laid at full length; chiefly said of the hind-toe when its whole length rests on the ground or other support, owing to its low insertion on the level of the rest. (131.)
In´cus, a. A bone of the inner ear of mammalia, held by high authority to be homologous with the os quadratum of birds (which see). See also Malleus.
In´dex, n. The principal digit of the wing is often so called, but is really homologous with the third or middle finger of mammals; the pollex or so-called thumb of birds being the homologue of the mammalian index.
In´doles, n. Natural disposition.
Indumen´tum, n. Covering of birds; the ptilosis or plumage. (142.)
In´fra- (in composition). Below; under; opposite of supra-. It is in part synonymous with sub-, but refers only, to position, while sub- is of more extensive application.
Inframax´illary, n. The under jaw bone, or mandible.
Infraor´bital, a. Below the eye-socket.
Infundibu´liform, a. Funnel-shaped.