Len"ti*cel (l&ebreve;n"t&ibreve;*s&ebreve;l), n. [F. lenticelle, dim. fr. L. lens, lentis, a lentil. Cf. Lentil.] (Bot.) (a) One of the small, oval, rounded spots upon the stem or branch of a plant, from which the underlying tissues may protrude or roots may issue, either in the air, or more commonly when the stem or branch is covered with water or earth. (b) A small, lens-shaped gland on the under side of some leaves.