\Un"du*la`ted\, a. 1. Resembling, or in the nature of, waves; having a wavy surface; undulatory. 2. (Bot.) Waved obtusely up and down, near the margin, as a leaf or corolla; wavy. 3. (Zo["o]l.) Formed with elevations and depressions resembling waves; having wavelike color markings; as, an undulated shell.