What is the meaning of Astragal?

Synonym of anklebone: the bone forming the ball of the ankle joint.

A die, especially a four-sided die historically made from or in imitation of an ankle bone.

A semicircular molding separating the architrave at the top or bottom of a column.

A tool used to mold such features; similar tools used for connecting panes of glass in a window.

A circular molding near the mouth of a cannon.

Synonym of milkvetch: a plant of the genus Astragalus.

A molding attached to double doors to prevent drafts.

A bracket used to fix downpipes to the wall of a building.

astragal

astragal (semicircular molding separating the architrave at the top or bottom of a column)

astragalus

Source: wiktionary.org