Definition of proto- in English:


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

combining form

1Original; primitive: prototherian prototype
1.1First; anterior; relating to a precursor: protomartyr protozoan


from Greek prōtos 'first'.

Definition of proto- in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
relating to the state immediately preceding waking up