actino-

a 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 especially before a vowel, actin-.

Origin of actino-

< Greek, combining form representing aktī́s (genitive aktînos) ray, beam; see -o-

Words nearby actino-

actiniform, actinin, actinism, actinium, actinium series, actino-, actinobacillosis, actinobacillus, actinobiology, actinochemistry, actinodermatitis

British Dictionary definitions for actino-

actino-

before a vowel actin-

combining form

indicating a radial structure actinomorphic
indicating radioactivity or radiation actinometer

Word Origin for actino-

from Greek aktino-, from aktis beam, ray

Medical definitions for actino-

actino-

pref.

Actinic radiation:actinotherapy.