Plural of cusp; pointed projections or peaks, whether on teeth, mountains, or architectural elements.
From Latin cuspis meaning 'point' or 'spear.' The singular cusp was adopted into English during the medieval period and refers to any pointed projection.
Cusps appear everywhere in nature—mountain peaks, coral polyps, flower petals—and in architecture like cathedral arches. This is why the same word works for something as different as a tooth and a building!
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