/ Dictionary / Index C calomel: Meaning and Definition of Find definitions for: cal•o•mel Pronunciation: (kal'u-mel", -mul), [key] — n. Pharm. a white, tasteless powder, HgCl, used chiefly as a purgative and fungicide. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: calomel (Thesaurus) calochortus calomel electrode Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language