[v. uhn-juh-leyt, uhn-dyuh-, -duh-; adj. uhn-juh-lit, -leyt, uhn-dyuh-, -duh-]
verb (used without object), undulated, undulating.
to move with a sinuous or wavelike motion; display a smooth rising-and-falling or side-to-side alternation of movement: The flag undulates in the breeze.
to have a wavy form or surface; bend with successive curves in alternate directions.
(of a sound) to rise and fall in pitch: the wail of a siren undulating in the distance.
verb (used with object), undulated, undulating.
to cause to move in waves.
to give a wavy form to.
Also, undulated. having a wavelike or rippled form, surface, edge, etc.; wavy.

1650–60; < Latin undulātus waved, equivalent to und(a) wave + -ul(a) -ule + -ātus -ate1

undulator, noun
nonundulate, adjective
nonundulating, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
undulate (ˈʌndjʊˌleɪt)
1.  to move or cause to move in waves or as if in waves
2.  to have or provide with a wavy form or appearance
3.  having a wavy or rippled appearance, margin, or form: an undulate leaf
[C17: from Latin undulātus, from unda a wave]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1660s, from undulation. Related: undulated, undulating.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The plesiosaur, being a reptile, wouldn't undulate but move from side to side.
Every time a major storm blew in from the north, the sea would undulate under
  our camp, and the ice would break up all around us.
The roof is an ocean swell thickly rippled with ceramic tiles that undulate in
  colors as well as curves.
Tents of many kinds and sizes undulate across the dunes.
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