\Len"ti*cel\ (l[e^]n"t[i^]*s[e^]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.