(1):

(a.) Waved obtusely up and down, near the margin, as a leaf or corolla; wavy.

(2):

(imp. & p. p.) of Undulate

(3):

(a.) Resembling, or in the nature of, waves; having a wavy surface; undulatory.

(4):

(a.) Formed with elevations and depressions resembling waves; having wavelike color markings; as, an undulated shell.