Merriam-Webster's Word of the Day for March 25, 2026 is:
 
 
 
 
 undulate &#149; \UN-juh-layt\&nbsp; &#149; verb
 Undulate is a formal word that means “to move or be shaped like waves.”

// On the approach to the tulip festival, visitors are greeted by a large field of the colorful flowers undulating in the wind.

<a href="https://www.merriam-webster.com/dictionary/undulate">See the entry ></a>
 
 
 
 Examples:
 “When sufficiently heated, the fresh cheese contracts, sweating whey from the curds that provides liquid to cook the dough, which will plump up and undulate slightly as it expands.” — Karima Moyer-Nocchi, The Epic History of Macaroni and Cheese: From Ancient Rome to Modern America, 2026 
 
 
 
 Did you know?
 Undulate and <a href="https://www.merriam-webster.com/dictionary/inundate">inundate</a> (“to cover something with a flood of water”) are word cousins that flow from unda, the Latin word for “wave.” No surprise there. But would you have guessed that <a href="https://www.merriam-webster.com/dictionary/abound">abound</a>, <a href="https://www.merriam-webster.com/dictionary/surround">surround</a>, and <a href="https://www.merriam-webster.com/dictionary/redound">redound</a> are also unda offspring? While their modern definitions have nothing to do with waves or water, at some point in their early histories, they all meant “to overflow,” and caught a wave from there.

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