astragal

[as-truh-guhl]
noun Architecture, Furniture.
1.
a small convex molding cut into the form of a string of beads. Compare bead and reel.
2.
a plain convex molding; bead.
3.
a molding attached to one or both meeting stiles of a pair of double doors in order to prevent drafts.

Origin:
1555–65; < Latin astragalus < Greek astrágalos a vertebra, the huckle-bone, a molding, a kind of vetch; in plural, dice (i.e., huckle-bones)

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World English Dictionary
astragal (ˈæstrəɡəl)
 
n
1.  architect
 a.  Also called: bead a small convex moulding, usually with a semicircular cross section
 b.  a moulding having the form of a string of beads
2.  carpentry a glazing bar, esp in a bookcase
3.  anatomy the ankle or anklebone
 
[C17: from Latin astragalus, from Greek astragalos anklebone, hence, small round moulding]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Rigid astragal overlapping meeting edge is prohibited.
The exterior side of the door shall have a lock guard or astragal to prevent jimmying of the latch hardware.
The astragal is attached to the lock stile thru the aluminum reinforcement with screws.
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