Part 145

EMBRYOL´OGY, n. Science or study of the development of animals before birth or hatching.

EMBRYON´IC, a. Pertaining to an embryo; being an embryo; not yet hatched.

ENAM´EL, n. The hard white substance covering the teeth.

ENARTHRO´SIS, n. Ball-and-socket joint.

ENCEPH´ALON, n. Contents of the cranium, especially the brain.

ENDOCAR´DIUM, n. Lining membrane of the heart.

ENDOG´ENOUS, a. Of internal growth or formation; interstitially deposited. Compare autogenous. Opposed to exogenous.

ENDOSKEL´ETON, n. The skeleton proper, or skeleton as commonly understood; the inner bony framework of the body. (Used in distinction from exoskeleton or dermoskeleton, such as some animals possess.)

ENTER´IC, a. Belonging or relating to the intestines; intestinal.

ENTO- (in composition). Inner.

EPENCEPH´ALON, n. Hindmost segment of the brain.

EPI- (in composition). On; upon; over. Opposed to hypo-.

EPIDER´MIS, n. Cuticle or scarf-skin.

EPIDID´YMIS, n. An associate organ of the testis, in birds apparently a remnant of the primordial kidney.

EPIGAS´TRIUM, n. Pit of stomach; upper belly, next to breast. (A region not well distinguished in birds. The term is scarcely used.) (64.)

EPIGLOT´TIS, n. Gristly flap on top of windpipe, rudimentary or wanting in birds.

EPIGNATH´OUS, a. Hook-billed.

EPIOT´IC, a. for n. A certain element of the auditory capsule.

EPIPH´YSIS, n. Gristly cap on the end of a bone, afterward becoming bony and united.

EPIPLEU´RA, n. An obliquely backward bony process of a vertebral rib.

EPITHE´LIUM, n. Superficial layer of mucous membrane. Sometimes also the thick tough membrane lining the gizzard.

EPITHE´MA, n. Horny excrescence upon the bill.

EPIZO´ÖN, n. An external parasite.

EPIZOÖT´IC, a. Parasitic among animals.

EREC´TILE, a. Susceptible of being raised, as a crest; or capable of swelling and stiffening, as a penis.

ER´YTHRISM, n. A particular state of plumage characterized by excess of red pigment; it is well shown in Scops asio and other owls. (Compare albinism and melanism.)

ETH´MOID, n. One of the cranial bones, in the nasal region.

ETYP´ICAL, a. Of exceptional character. Tending away from a particular type. Opposed to attypical.