Calcar

(n.) A kind of oven, or reverberatory furnace, used for the calcination of sand and potash, and converting them into frit.

(n.) A hollow tube or spur at the base of a petal or corolla.

(n.) A slender bony process from the ankle joint of bats, which helps to support the posterior part of the web, in flight.

(n.) A spur, or spurlike prominence.

(n.) A curved ridge in the floor of the leteral ventricle of the brain; the calcar avis, hippocampus minor, or ergot.

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