calcar

n., pl., cal·car·i·a (kăl-kâr'ē-ə).
A spur or spurlike projection, such as one found on the base of a petal or on the wing or leg of a bird.

[Latin, spur, from calx, calc-, heel.]

cal·car² (kăl'kär')
n.
A furnace formerly used in glassmaking for calcination of materials into frit.

[Italian calcara, from Late Latin calcāria (fornāx), lime(-kiln), from Latin, feminine of calcārius, of lime. See calcareous.]

(kăl'kär')
n., pl. cal·car·i·a (kăl-kâr'ē-ə).

1. A small spurlike projection from a structure.
2. An internal septum at the level of division of arteries and confluence of veins when branches or roots form an acute angle.
3. A dull spine or projection from a bone.
4. A horny outgrowth from the skin.

A spur or spur-shaped structure.

• c. avis — the lower of two medial elevations in the lateral cerebral ventricle, produced by the lateral extension of the calcarine sulcus; called also hippocampus minor.
• c. metacarpale, c. metatarsale — see ergot2.