nonagonaladj.

Brit.

/nɒnˈaɡənl/,

/nɒnˈaɡn̩l/, U.S.

/nɑnˈæɡən(ə)l/,

/noʊnˈæɡən(ə)l/

Origin: Formed within English, by derivation. Etymons: nonagon n., -al suffix¹.

Etymology: < nonagon n. + -al suffix¹.

Of a figure: having nine straight sides and nine angles. Also: of or relating to nonagons; (Mathematics) designating each of the series of polygonal numbers 1, 9, 24, 46…, each of which can be represented by a pattern of dots in the form of a regular nonagon.

ΚΠ

1798 Philos. Trans. (Royal Soc.) 88 431 If the superposition continues, the equilateral triangular plane on the summit will become nonagonal.

1852 T. Kentish Treat. Box Instruments & Slide-rule 222 The frustum of a nonagonal pyramid measures 3 inches along each side at top, and 4 at bottom.

1939 Amer. Jrnl. Bot. 26 287/2 Triangular, heptagonal, octagonal, and nonagonal, as well as quadrilateral and hexagonal faces occur.

1981 Electronics 14 July 40 The new approach uses a nine-sided die..to pull a thinwalled, nonagonal tube from the melt.

1982 Jrnl. Recreational Math. 15 184 (heading) 9 and 10 distinct digits in nonagonal numbers.

1987 Math. Rev. June 2883/1 The polynomials of the nonagonal and decagonal chains.

This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022).

单词	nonagonal
释义	nonagonaladj. Brit. /nɒnˈaɡənl/, /nɒnˈaɡn̩l/, U.S. /nɑnˈæɡən(ə)l/, /noʊnˈæɡən(ə)l/ Origin: Formed within English, by derivation. Etymons: nonagon n., -al suffix¹. Etymology: < nonagon n. + -al suffix¹. Of a figure: having nine straight sides and nine angles. Also: of or relating to nonagons; (Mathematics) designating each of the series of polygonal numbers 1, 9, 24, 46…, each of which can be represented by a pattern of dots in the form of a regular nonagon. ΚΠ 1798 Philos. Trans. (Royal Soc.) 88 431 If the superposition continues, the equilateral triangular plane on the summit will become nonagonal. 1852 T. Kentish Treat. Box Instruments & Slide-rule 222 The frustum of a nonagonal pyramid measures 3 inches along each side at top, and 4 at bottom. 1939 Amer. Jrnl. Bot. 26 287/2 Triangular, heptagonal, octagonal, and nonagonal, as well as quadrilateral and hexagonal faces occur. 1981 Electronics 14 July 40 The new approach uses a nine-sided die..to pull a thinwalled, nonagonal tube from the melt. 1982 Jrnl. Recreational Math. 15 184 (heading) 9 and 10 distinct digits in nonagonal numbers. 1987 Math. Rev. June 2883/1 The polynomials of the nonagonal and decagonal chains. This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022). < adj.1798
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