enneagonn.

/ˈɛniːəɡən/

Forms: Also 1600s -one.

Etymology: < Greek ἐννέα nine + γωνία angle.

A plane figure with nine angles.

ΘΚΠ

the world > space > shape > angularity > specific angular shape > [noun] > polygon > nonagon

nonagon1639

enneagon1660

the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > nonagon

nonagon1639

enneagon1660

1660 tr. I. Barrow Euclide's Elements i. 85 Then is AB the side of an Enneagone.

1721–1800 in N. Bailey Universal Etymol. Eng. Dict.

1817 H. T. Colebrooke tr. Bhāskara Āchārya in Algebra 92 The regular pentagon, heptagon, and enneagon.

Derivatives

enneˈagonal adj. having nine angles.

This entry has not yet been fully updated (first published 1891; most recently modified version published online December 2020).

单词	enneagon
释义	enneagonn. /ˈɛniːəɡən/ Forms: Also 1600s -one. Etymology: < Greek ἐννέα nine + γωνία angle. A plane figure with nine angles. ΘΚΠ the world > space > shape > angularity > specific angular shape > [noun] > polygon > nonagon nonagon1639 enneagon1660 the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > nonagon nonagon1639 enneagon1660 1660 tr. I. Barrow Euclide's Elements i. 85 Then is AB the side of an Enneagone. 1721–1800 in N. Bailey Universal Etymol. Eng. Dict. 1817 H. T. Colebrooke tr. Bhāskara Āchārya in Algebra 92 The regular pentagon, heptagon, and enneagon. Derivatives enneˈagonal adj. having nine angles. This entry has not yet been fully updated (first published 1891; most recently modified version published online December 2020). < n.1660
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