Merriam-Webster's Word of the Day for March 8, 2026 is:
 
 
 
 
 crepuscular &#149; \krih-PUHSS-kyuh-ler\&nbsp; &#149; adjective
 Crepuscular means “of, relating to, or resembling twilight.” It is used in zoological contexts to describe creatures that are active during twilight, or the activities of such creatures.

// As evening came on, fireflies began to appear in the crepuscular <a href="https://www.merriam-webster.com/dictionary/gloaming">gloaming</a>.

<a href="https://www.merriam-webster.com/dictionary/crepuscular">See the entry ></a>
 
 
 
 Examples:
 “To gaze upon a platypus is to witness a jumble of contradictions. … Even when you see one with your own eyes—say, paddling underwater, absorbed in her crepuscular rooting—the platypus (Ornithorhynchus anatinus) remains hard to believe.” — Kathleen Yale, Orion, Winter 2025/2026
 
 
 
 Did you know?
 The early Romans had two words for the twilight. Crepusculum was favored by Roman writers for the half-light of evening, just after the sun sets; diluculum was reserved for morning twilight, just before the sun rises—it is related to lūcidus, meaning “bright.” (Crepusculum was likely modeled on diluculum, from the assumed root krepos-, meaning “twilight.”) English speakers didn’t embrace either of these Latin nouns as substitutes for the word <a href="https://www.merriam-webster.com/dictionary/twilight">twilight</a>, but they did form the adjective crepuscular in the 17th century. The word’s zoological sense, relating to animals that are most active at twilight, developed in the 19th century.

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