halations or vapors coming from
the body, and from decaying animal or vegetable substances.

Element. One of the simplest parts of which anything consists.

Elimination (Lat. _e_, out of, and _limen, liminis_, a threshold). The act
of _expelling_ waste matters. Signifies, literally, "to throw out of
doors."

Emetic (Gr. emeo, to vomit). A medicine which causes vomiting.

Emulsion (Lat. _emulgere_, to milk). Oil in a finely divided state,
suspended in water.

Enamel (Fr. _email_). Dense material covering the crown of a tooth.

Endolymph (Gr. endon, within, and Lat. _lympha_, water). The fluid in the
membranous labyrinth of the ear.

Endosmosis (Gr. endon, within, and o#x1F60;theo, to push). The current
from without _inwards_ when diffusion of fluids takes place through a
membrane.

Epidemic (Gr. epi, upon, and demos, the people). An extensively prevalent
disease.

Epiglottis (Gr. epi, upon, and glottis, the entrance to the windpipe). A
leaf-shaped piece of cartilage which covers the top of the larynx during
the act of swallowing.

Epilepsy (Gr. epilepsis, a seizure). A nervous disease accompanied by fits
in which consciousness is lost; the falling sickness.

Ether (Gr. aither, the pure, upper air). A narcotic poison. Used as an
anaesthetic in surgical operations.

Eustachian (from an Italian anatomist named Eustachi). The tube which
leads from the throat to the middle ear, or tympanum. Excretion (Lat.
_excerno_, to separate). The separation from the blood of the waste
matters of the body; also the materials excreted.

Exosmosis (Gr. exio, without, and atheo, to push). The current from within
_outwards_ when diffusion of fluids takes place through a membrane.

Expiration (Lat. _expiro_, to breathe out). The act of forcing air out of
the lungs.

Extension (Lat. _ex_, out, and _tendo_, to stretch). The act of restoring
a limb, etc., to its natural position after it has been flexed or bent;
the opposite of _flexion_.

Fauces. The part of the mouth which opens into the pharynx.

Fenestra (Lat.). Literally, "a window." Fenestra ovalis and fenestra
rotunda, the oval and the round window; two apertures in the bone between
the tympanic cavity and the labyrinth of the ear.

Ferment. That which causes fermentation, as yeast.

Fermentation (Lat. _fermentum_, boiling). The process of undergoing an
effervescent change, as by the action of yeast; in a wider sense, the
change of organized substances into new c