noun Biochemistry.

any of a family of steroid lactones, occurring in toad venom and squill, that possess cardiac-stimulating and antitumor activity.

Origin of bufadienolide

1965–70; from bufa-20, 22-dienolide a chemical component of such lactones; compare Latin būfō toad
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019