Having a cusp or cusps; ending in a sharp point or points (used in biology, geology, and mathematics).
From Latin 'cuspis' meaning point or spike, with the suffix '-ated' (meaning having or characterized by). The word evolved from describing sharp points on teeth.
A cusp is that pointy bit on your molars—cusps help you chew. The same word appears in math (cusp curves), geology (cusped formations), and geography (cusps of coastlines).
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