deutero-

deutero- or deuter-

pref.

Second; secondary: deuterocanonical.

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[Greek deuteros, second, secondary; see deu-¹ in Indo-European roots.]

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deutero-, deuto- before a vowel, deuter-, deut-

combining form

1. second or secondary deuterogamy deuterium

2. (Chemistry) indicating the presence of deuterium

[from Greek deuteros second]

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deutero-

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