Definition of proto- in English:

proto-

Syllabification: proto-
(usually prot- before a vowel)

combining form

1.1First; anterior; relating to a precursor: protomartyr protozoan

Origin

from Greek prōtos 'first'.

Definition of proto- in:

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Word of the day vinaceous
Pronunciation: vīˈnāSHəs
adjective
of the color of red wine