octangle

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English[edit]

Etymology[edit]

oct- +‎ angle

Pronunciation[edit]

  • enPR: ŏkʹtăng-gl, IPA(key): /ˈɑk.tæŋ.ɡ(ə)l/

Noun[edit]

octangle (plural octangles)

  1. A geometric figure with eight corners, an octagon.
    • 1853 May, Thomas Weddle, “On certain geometrical relations between a surface of the second degree and a tetrahedron whose edges touch the surface”, The Cambridge and Dublin Mathematical Journal, volume 8, page 130: 
      The angles of any two of the tetrahedra ABCD, A′B′C′D′, and OO′O″O‴ form the angles of a complete syngrammatic octangle whose syngrammatic points are the angles of the other tetrahedron []