"geometric figure having seven sides and seven angles," 1550s, from Late Latin septangulus, from Latin sept- "seven" (see septi-) + angulus "angle" (see angle (n.)). Related: Septangular.
Entries linking to septangle
septi-
before vowels sept-, word-forming element meaning "seven," from Latin septem (see seven). A parallel formation to septem-.
angle n.
"space or difference in direction between intersecting lines," late 14c., from Old French angle "an angle, a corner" (12c.) and directly from Latin angulus "an angle, a corner," a diminutive form from PIE root *ang-/*ank- "to bend" (source also of Greek ankylos "bent, crooked," Latin ang(u)ere "to compress in a bend, fold, strangle;" Old Church Slavonic aglu "corner;" Lithuanian anka "loop;" Sanskrit ankah "hook, bent," angam "limb;" Old English ancleo "ankle;" Old High German ango "hook").
The figurative sense "point or direction from which one approaches something" is from 1872. Angle-bracket is attested by 1781 in carpentry; 1956 in typography.