/ Dictionary / Index S seleno-: Meaning and Definition of Find definitions for: seleno- Pronunciation: [key] a combining form meaning “moon,” used in the formation of compound words: selenography. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. selenium rectifier selenocentric Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language