/ Dictionary / Index A actinology: Meaning and Definition of Find definitions for: ac•ti•nol•o•gy Pronunciation: (ak"tu-nol'u-jē), [key] — n. the science that deals with actinism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. actinolite actinometer Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language