exo-, ex-

A branch of biology with a special interest in the search for life on other planets and elesewhere in the universe, and with the study of conditions that might give rise to extraterrestrial life, as well as the study of the effects of extraterrestrial environments.

Living on the exterior of a substrate (substratum) [base to which a stationary animal or a plant is fixed] or the outside of an organism.

The outer layer of the procuticle of certain crustaceans and arthropods, which contains cuticulin, chitin, and phenolic substances that are oxidized to produce the dark pigment of the cuticle.

A dentist who specializes in the extraction of teeth.

The branch of dentistry concerned with the extraction of teeth.