calcar

calcar is defined in Webster's Unabridged Dictionary (1913) with 3 senses. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.(Bot.) A hollow tube or spur at the base of a petal or corolla.
  2. 2.(Zoöl.) A slender bony process from the ankle joint of bats, which helps to support the posterior part of the web, in flight.
  3. 3.(Anat.) (a) A spur, or spurlike prominence. (b) A curved ridge in the floor of the leteral ventricle of the brain; the calcar avis, hippocampus minor, or ergot.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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