acumen

Meanings

1. 1
   noun

   A bony, often sharp, protuberance, especially that of the ischium.

   The rostrum is the anterior extension of the carapace between the eyes. It ends in a more or less acute tip, or acumen, and may have a lateral spine on each side or bear a longitudinal keel (carina) on the dorsal surface.

Borrowed from Latin acūmen (“sharp point”).

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