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Merriam-Webster's Word of the Day for August 15, 2021 is:

undulant • \UN-juh-lunt\  • adjective

Undulant describes the rise and fall of waves, or things that move or have a form like waves.

// We followed the undulant green hills on our journey to the resort.

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Examples:

"Gilliam broke ranks with the movement—or extended it—in the mid-sixties, when he began draping vast unstretched paint-stained and -spattered canvases from walls and ceilings, creating undulant environments that drenched the eye in effulgent color." — Peter Schjeldahl, The New Yorker, 9 Nov. 2020

Did you know?

Unda, Latin for "wave," is the root of undulant, as well as words such as abound, inundate, redound, surround, and the verb undulate, which means "to form or move in waves." The meaning of undulant is now broad enough that it could describe things as disparate as a snake’s movement and a fever that waxes and wanes.