What does astragal mean?
An astragal is a small, narrow moulding with a rounded, half-round profile, used in architecture and fine joinery to cover a joint or to divide the panes of a window or the leaves of a pair of doors. Cabinetmakers and glaziers rely on it both structurally and decoratively, since it neatly conceals the meeting line between two surfaces while adding a subtle classical flourish. The word has a second, older life in anatomy: the astragal is the ankle bone — known to anatomists as the talus — whose knuckled shape reminded early writers of the dice-like bones once used in ancient games. That shared history links a humble strip of timber to one of humanity's oldest playthings. Though largely technical in register, appearing chiefly in trade catalogues, conservation documents, and medical texts, the term remains current wherever traditional joinery is specified.
nounA small semicircular moulding with a convex profile, used especially in classical architecture to separate parts of a column or frame; also, the bone of the ankle joint (the talus), so named for its knuckle-like shape.
- A narrow convex moulding used in architecture, joinery, and glazing to cover joints or divide panes.
- The ankle bone (talus) in humans and animals, formerly used as a gaming piece.
"The cabinetmaker finished the glazed door with a slender astragal down its centre."
"A delicate astragal runs between each pane of the sash window."
"In archaeological reports, the astragal bones of sheep often appear among the earliest gaming pieces."
In general and technical building contexts the plural is 'astragals'; scholarly anatomical writing often uses the Latinate 'astragali'.
"The restoration replaced every missing astragal along the orangery's tall windows."
The little rounded strip of wood dividing a pair of French doors takes its name from the dice ancient Greeks carved from ankle bones — which is also why your ankle's talus bone shares the very same name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of astragal
Astragal comes from the ancient Greek 'astragalos', meaning both the knucklebone or ankle joint and the die made from such a bone, which Greeks used for gaming and divination. Latin borrowed the word directly as 'astragalus', preserving both meanings, and English adopted it in the sixteenth century, applying it chiefly to the rounded architectural moulding while anatomists retained the skeletal sense. The Latin form survives today as the scientific name of the milkvetch plant genus, whose pod was thought to resemble the little bone.
How astragal is actually used
Predominantly a technical term encountered in architecture, furniture-making, and anatomy rather than everyday speech. The plural 'astragali' appears mainly in anatomical and archaeological writing.
Easily confused with astragal
Astragalus is a large genus of flowering plants (milkvetches); astragal is either an architectural moulding or the ankle bone.