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
indicating a radial structure: actinomorphic
indicating radioactivity or radiation: actinometer

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.”

actino- or actin-
Actinic radiation: actinotherapy.

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  • Actinobacillus

    any of several spherical or rod-shaped, aerobic, parasitic bacteria of the genus Actinobacillus, certain species of which, as A. mallei, are pathogenic for animals.

  • Actinobacillosis

    an infectious disease of cattle, domestic animals, and occasionally humans, resembling actinomycosis and caused by the bacterium Actinobacillus lignieresii. noun (vet science) a disease of cattle and sheep, caused by infection with an Actinobacillus lignieresii and characterized by soft tissue lesions, esp of the tongue Also called wooden tongue, woody tongue, cruels

  • Actinochemistry

    the branch of dealing with actinism; photochemistry. noun another name for photochemistry

  • Actinobiology

    noun the branch of biology concerned with the effects of radiation on living organisms

  • Actinodermatitis

    inflammation of the skin caused by sunlight or other radiation. noun dermatitis from exposure to radiation, esp ultraviolet light or X-rays actinodermatitis ac·ti·no·der·ma·ti·tis (āk’tə-nō-dûr’mə-tī’tĭs) n. Inflammation of the skin produced by exposure to sunlight. Adverse reaction of skin to radiation therapy.

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