Part 144

DITOK´OUS, a. Producing but two eggs, as the pigeon and humming-bird.

DIUR´NAL, a. Pertaining to the daytime.

DIVAR´ICATE, a. Branching off; spreading apart; curving away.

DIVERTIC´ULUM, n. An offshoot of the small intestine.

DOR´SAD, a. Toward the back. Opposite of ventrad.

DOR´SAL, a. Pertaining to the back.

DOR´SUM, n. Back; upper surface of trunk from neck to rump. (57.)

DOWN, n. Small soft feathers of plumulaceous structure, generally growing about the roots of plumæ, and concealed by them. See PLUMULÆ.

DOWN´Y, a. Of plumulaceous structure. A part of the plumage is of down-feathers, and the bases of the contour feathers usually also are of downy structure.

DUCT, a.. Any tube for conveyance of an animal product; as oviduct, sperm-duct, lachrymal duct.

DUOD´ENAL, a. Pertaining to the duodenum.

DUOD´ENUM, n. A short portion of the upper intestine next to the gizzard, receiving the pancreatic and hepatic secretions.

DU´RA MA´TER, n. Outer membranous investment of the brain.

DUSK´Y, a. Of any undefined dark color.

EARED, a. Having lengthened or highly colored auricular or other feathers on the side of the head. Eared grebe; long-eared owl.

EC´DYSIS, n. Moult; the shedding and renewal of plumage.

ECON´OMY (also written œconomy), n. Physical or physiological disposition. (Literally, regulation of a household.)

ECTO- (in composition). Outer.

ECTOZO´ÖN, n. External parasite, as a louse; same as epizoön. Opposed to entozoön.

EDEN´TATE, EDEN´TULOUS, a. Toothless, as nearly all birds are.

EDGE OF WING. (95.) See CAMPTERIUM.

EF´FERENT, a. Conveying outward or away; opposed to afferent.

EL´EMENT, n. A simple ultimate constituent part of a compound organ. The centrum is an element of a vertebra.

EL´EVATED, a. Said of the hind toe when inserted above the level of the others.

ELON´GATE, a. Lengthened beyond usual ratio.

EMAR´GINATE, a. Notched at the end; slightly forked, especially in case of a tail so shaped; also notched, or abruptly narrowed along the edge, in its continuity, as the border of many a wing-quill.

EMBONPOINT, n. State of perfect health, as indicated by condition of fatness not amounting to corpulence or obesity.

EM´BRYO, n. Fecundated germ or rudiment of an animal; said of a bird until hatched, and therefore corresponding to fœtus in mammalogy.