/ Dictionary / Index C crotalin: Meaning and Definition of Find definitions for: cro•ta•lin Pronunciation: (krōt'l-in), [key] — n. Biochem. a protein in the venom of pit vipers, used as an antigen in the preparation of snake antivenins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. crossword puzzle crotch Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language