Definition of proto- in English:

proto-

Pronunciation: /ˈprəʊtəʊ/
(usually prot- before a vowel)

combining form

1Original or primitive: prototherian prototype
1.1First or earliest: protomartyr protozoon

Origin

from Greek prōtos 'first'.

Definition of proto- in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous