IN´GUINAL, _a._ Pertaining to the groin.
INNER TOE, _n._ (127.) In most birds the second is the inner anterior
toe; in the trogons, the third or middle toe becomes inner anterior by
reversion of the second, which is then inner posterior. In a few exotic
kingfishers, the second or inner anterior is rudimentary or wanting. In
several birds the hallux or first or hinder toe is reversed, and becomes
inner anterior. But in any position the _inner toe_, properly speaking,
is the second, that one with only three joints.
INNOM´INATE (_bone_), _n._ The pelvic bone, composed of ilium, ischium,
and pubis.
INOSCULA´TION, _n._ Same as ANASTOMOSIS (which see).
INSECTIV´OROUS, _a._ Insect-eating.
INSESSO´RES, _n. pl._ Perching-birds; an order now becoming obsolete.
INSESSO´RIAL, _a._ Relating to perching-birds.
INSIS´TENT, _a._ Said of the hind toe, when its base is so elevated that
the tip only touches the ground. (130.)
IN´STINCT, _n._ Imperfect reason; the faculty of doing the right thing
without knowing why.
INTEG´UMENT, _n._ A covering or envelope; commonly, the skin.
INTER- (_in composition_). Between; among.
INTERARTIC´ULAR, _a._ Between the joints; in a joint; as,
_interarticular_ cartilage.
INTERCOS´TAL, _a._ Between two ribs; as, _intercostal_ muscle, artery,
vein.
INTERMAX´ILLARY (_bone_), _n._ Same as PREMAXILLARY (which see).
IN´TERNODE, _n._ Any bone of a finger or toe.
INTEROR´BITAL, _a._ Between the eye-sockets.
INTERRA´MAL, _a._ Between the forks or rami of the lower jaw.
INTERRUPT´ED, _a._ Discontinuous; broken up.
INTERSCAPIL´IUM or INTERSCAP´ULUM, _n._ Region of the upper back between
the shoulders. (58.)
INTERSCAP´ULAR, _a._ Between the shoulders. The plural, _interscapulars_
or interscapularies, is used to denote the feathers of such region
collectively.
INVAG´INATE, _a._ Sheathed.
INVER´TEBRATE, _a._ or _n._ Having no backbone; an animal without a
backbone. Opposed to _vertebrate_.
I´RIAN, IRID´IAN, _a._ Pertaining to the iris.
IRIDES´CENT, _a._ Glittering with many colors, which change in different
lights.
I´RIS, _n._ Circular muscular curtain suspended perpendicularly in the
eye between the aqueous and vitreous chambers, having a hole in the
centre (the pupil). It is of all colors in birds.
ISCHIAT´IC, _a._ Pertaining to the ischium.
IS´CHIUM, _n._ One of the pelvic bones, the hindermost.
-ISH. A suffix, forming an adjective, _usually_ denoting possession of a
quality in less degree; especially used for colors; as, _blackish_, not
quite black, etc.
ISTH´MUS, _n._ Neck or narrow strip connecting two larger portions of
same region, patch of color, etc.