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WordReference Random House Unabridged Dictionary of American English © 2024ac•tin (ak′tən),USA pronunciation n. [Biochem.]- Biochemistrya globulin that is present in muscle plasma and that in connection with myosin plays an important role in muscle contraction.
actin-, - Physicsvar. of actino- before a vowel:actinism.
WordReference Random House Unabridged Dictionary of American English © 2024actino-, - Physicsa combining form with the meaning "ray, beam,'' used in the formation of compound words, with the particular senses "radiation'' in the physical sciences (actinometer) and "having raylike structures,'' "radiate in form'' in biology (actinomyces;
actinopod).
Also,[esp. before a vowel,] actin-. - Greek, combining form representing aktí̄s (genitive aktînos) ray, beam; see -o-
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