actino-









actino-


  1. 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).

combining form

  1. indicating a radial structureactinomorphic
  2. indicating radioactivity or radiationactinometer

before vowels actin-, word-forming element meaning “pertaining to rays,” from Greek aktis (genitive aktinos) “ray, radiance;” perhaps cognate with Sanskrit aktuh “light, ray,” Gothic uhtwo “dawn, daybreak,” Lithuanian anksti “early.”

pref.

  1. Actinic radiation:actinotherapy.
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