follow Dictionary.com

11 Trending Words of 2014

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).
Also, especially before a vowel, actin-.
Origin
< Greek, combining form representing aktī́s (genitive aktînos) ray, beam; see -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for actino-

actino-

combining form
1.
indicating a radial structure: actinomorphic
2.
indicating radioactivity or radiation: actinometer
Word Origin
from Greek aktino-, from aktis beam, ray
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for actino-

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."

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
actino- in Medicine

actino- or actin-
pref.
Actinic radiation: actinotherapy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Word of the Day

Difficulty index for actino-

Few English speakers likely know this word

Word Value for actino

0
0
Scrabble Words With Friends