/ Dictionary / Index A arsenical: Meaning and Definition of Find definitions for: ar•sen•i•cal Pronunciation: (är-sen'i-kul), [key] — adj. containing or relating to arsenic. —n. any of a group of pesticides, drugs, or other compounds containing arsenic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arsenical (Thesaurus) arsenic acid arsenic disulfide Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language