actino-


Also found in: Medical.

actino-

or actin-
pref.
1. Radial in form: actinoid.
2. Actinic radiation: actinometer.

[From Greek aktīs, aktīn-, ray; see nekw-t- in Indo-European roots.]

actino-

or before a vowel

actin-

combining form
1. indicating a radial structure: actinomorphic.
2. indicating radioactivity or radiation: actinometer.
[from Greek aktino-, from aktis beam, ray]

actino-

a combining form with the meaning “ray, beam,” used with the particular senses “radiation” in the physical sciences (actinometer) and “having raylike structures,” “radiate in form” in biology (actinomyces).
[< Greek, comb. form representing aktis, genitive aktînos ray, beam; see -o-]
References in periodicals archive ?
Corolla (3-) 4-5 (8-10)-merous or absent in staminate flowers (Theligonum); aestivation valvate, imbricate or convolute; connate; usually actino-