Webster
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Webster’s Revised Unabridged Dictionary · 1913

Calcar

Cal′car (kăl′kär), n. [L. calcaria lime kiln, fr. calx, calcis, lime. See Calx.] (Glass manuf.) A kind of oven, or reverberatory furnace, used for the calcination of sand and potash, and converting them into frit. Ure.

Cal′car, n.; L. pl. Calcaria (#). [L., a spur, as worn on the heel, also the spur of a cock, fr. calx, calcis, the heel.] 1. (Bot.) A hollow tube or spur at the base of a petal or corolla.

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. (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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.