Di œ' cious, reproductive organs in different individuals.
Dip' te ra, insects with two wings, including flies, mosquitoes, etc.
Dis' tal end, the free end of any object which is attached by one end.
Dor' sal surface, the upper surface; the back.
Du' o de' num, the first portion of the small intestine.
Ec' to derm cells, cells covering the outside of sponges and some other simple animals.
Egg cell, the large, non-motile reproductive cell, with which a sperm cell fuses.
Em bry on' ic, development within the egg or in the body of the mother.
En' do derm cells, cells lining inner cavities in the many-celled animals. As a rule they have cilia or flagella.
E soph' a gus, the portion of the alimentary canal connecting the mouth (or the pharynx) with the stomach.