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The Collaborative International Dictionary
Septangle

Septangle \Sep"tan`gle\, n. [Septi- + angle.] (Geom.) A figure which has seven angles; a heptagon. [R.]

Douglas Harper's Etymology Dictionary
septangle

1550s, from Late Latin septangulus, from Latin sept- "seven" (see septi-) + angulus "angle" (see angle (n.)). Related: Septangular.

Wiktionary
septangle

n. (context geometry English) A figure which has seven angles; a heptagon.