calcar, n. [L., a spur, as worn on the heel, also the spur of a cock, fr. calx, calcis, the heel.].
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A hollow tube or spur at the base of a petal or corolla. [1913 Webster]
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A slender bony process from the ankle joint of bats, which helps to support the posterior part of the web, in flight. [1913 Webster]
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A spur, or spurlike prominence. [1913 Webster]