as·tra·gal /ˈæstrɪgəl/
圓圈
As·tra·gal n.
1. Arch. A convex molding of rounded surface, generally from half to three quarters of a circle.
2. Gun. A round molding encircling a cannon near the mouth.
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astragal
n 1: the bone in the ankle that articulates with the leg bones to
form the ankle joint [syn: anklebone, astragalus, talus]
2: a beaded molding for edging or decorating furniture [syn: beading,
bead, beadwork]