astragal

noun

1. Synonym of anklebone: the bone forming the ball of the ankle joint.
2. A die, especially a four-sided die historically made from or in imitation of an ankle bone.

   “For quotations using this term, see Citations:astragal.”

3. A semicircular molding separating the architrave at the top or bottom of a column.
4. A tool used to mold such features; similar tools used for connecting panes of glass in a window.
5. A circular molding near the mouth of a cannon.
6. Synonym of milkvetch: a plant of the genus Astragalus.
7. A molding attached to double doors to prevent drafts.
8. A bracket used to fix downpipes to the wall of a building.