Eu sta' chi an (eu sta' kian) tube, a passage between the pharynx and the middle ear.
Ex ha' lent, flowing or moving away from the body.
Ex' o skel' e ton, an external skeleton.
Eye stalk, an appendage which bears an eye on its free end.
Fe' mur, (1) the thigh bone; (2) the third joint of an insect's leg.
Fer ti li za' tion, the fusion of male and female elements in reproduction.
Fi' bers, flexible threads; fibers of a horny material are found in the walls of many of the sponges.
Fib' u la, the outer of the two long bones of the lower leg.
Fin, a paddle-like structure for swimming.
Fin-rays, the framework of the fins of fishes.