Definition of proto- in English:


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

combining form

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


from Greek prōtos 'first'.

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Definition of proto- in:

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Word of the day middlescent
Pronunciation: ˌmɪdəˈlɛs(ə)nt
middle-aged, but still maintaining youthful interests and activities