un·du·late ( n j -l t , ndy-, -d-)v. un·du·lat·ed, un·du·lat·ing, un·du·lates v.tr. 1. To cause to move in a smooth wavelike motion. 2. To give a wavelike appearance or form to. v.intr. 1. To move in waves or with a smooth, wavelike motion. See Synonyms at swing. 2. To have a wavelike appearance or form. 3. To increase and decrease in volume or pitch as if in waves. adj. (-l  t, -lt) Having a wavy outline or appearance: leaves with undulate margins. [From Late Latin undula, small wave, diminutive of Latin unda, wave; see wed-1 in Indo-European roots.] un du·la·tory (-l-tôr , -t r) adj. |   undulate leaf |
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