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From: Webster's Revised Unabridged Dictionary (1913)

 Cal·car, n.; L. pl. Calcaria
 1. Bot. A hollow tube or spur at the base of a petal or corolla.
 2. Zool. 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.
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