undulate

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To cause to move in a smooth wavelike motion.
2. v. To give a wavelike appearance or form to.
3. v. To move in waves or with a smooth, wavelike motion. See Synonyms at swing.
4. v. To have a wavelike appearance or form.
5. v. To increase and decrease in volume or pitch as if in waves.
6. adj. Having a wavy outline or appearance: leaves with undulate margins.

Century Dictionary and Cyclopedia

1. Wavy; having a waved surface. In botany, wavy; repand; bending, or having a margin which bends, slightly inward and outward: as, an undulate leaf; undulate striæ. Also undate, undulated. Compare sinuate , In zoology, marked with wavy lines. Specifically, in entomology; Wavy; forming a series of gentle curves which meet in reversed curves: as, an undulate line or margin. Rising and falling in gentle curves: said of surfaces and also of margins. Marked with parallel wavy lines.
2. To have a wavy motion; rise and fall in waves; move in waves.
3. Synonyms Waver, etc. See fluctuate.
4. To cause to wave, or move in waves; cause to vibrate.

Wiktionary

1. v. transitive To cause to move in a wavelike motion.
2. v. transitive To cause to resemble a wave
3. v. intransitive To move in wavelike motions.
4. v. intransitive To appear wavelike.
5. adj. Wavy in appearance or form.
6. adj. Changing the pitch and volume of one's voice.
7. adj. botany, of a margin Winding up and down gradually relative to the blade.

GNU Webster's 1913

1. adj. Same as undulated.
2. v. To cause to move backward and forward, or up and down, in undulations or waves; to cause to vibrate.
3. v. To move in, or have, undulations or waves; to vibrate; to wave.

WordNet 3.0

1. adj. having a wavy margin and rippled surface
2. v. stir up (water) so as to form ripples
3. v. move in a wavy pattern or with a rising and falling motion
4. v. occur in soft rounded shapes
5. v. increase and decrease in volume or pitch, as if in waves