Etymology

costellate

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Today it means: Finely ribbed or costate. Full definition →

New Latin costellātus
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The story

  1. New Latin · borrowed fromcostellātus
  2. English todaycostellate

Borrowed from New Latin costellātus, from costella (“small rib”) + -ātus, from costa (“rib”) + -ella (forms diminutives), see -ate (adjective-forming suffix).

Etymology from Wiktionary, CC BY-SA 4.0.