deutero-

1. a combining form meaning “second,” used in the formation of compound words: deuterocanonical.

combining form

1. second or secondarydeuterogamy; deuterium
2. (in chemistry) indicating the presence of deuterium

pref.

1. Second; secondary:deuteropathy.

1. A prefix meaning “second” or “secondary,” as in deuterostome, an animal whose mouth is the second opening to develop.