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WordReference Random House Unabridged Dictionary of American English © 2024prot-, - var. of proto- before a vowel:protamine.
Prot., - ReligionProtestant.
WordReference Random House Learner's Dictionary of American English © 2024proto-, prefix. proto- comes from Greek, where it has the meaning "first, foremost, earliest form of'':proto- + lithic → protolithic;
protoplasm.Also,[esp. before a vowel,] prot-.
WordReference Random House Unabridged Dictionary of American English © 2024proto-, - a combining form meaning "first,'' "foremost,'' "earliest form of,'' used in the formation of compound words (protomartyr;
protolithic;
protoplasm), specialized in chemical terminology to denote the first of a series of compounds, or the one containing the minimum amount of an element.
Also,[esp. before a vowel,] prot-. - Greek, combining form representing prôtos first, superlative formed from pró; see pro2-
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