英和和英

発音

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

名詞

octangle (複数形 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 […]