Leontodon \Le*on"to*don\ (l[-e]*[o^]n"t[-o]*d[o^]n), n. [Gr. le`wn, le`ontos, lion + 'odoy`s, 'odo`ntos, tooth. Cf. {Lion's-tooth}, {Dandelion}.] (Bot.) A genus of liguliflorous composite plants, including the fall dandelion ({L. autumnale}), and formerly the true dandelion; -- called also {lion's tooth}.