polyiamondn.

Brit.

/ˌpɒlɪˈʌɪəmənd/, U.S.

/ˌpɑliˈaɪ(ə)mən(d)/

Origin: Formed within English, by compounding. Etymons: poly- comb. form, diamond n.

Etymology: < poly- comb. form + iamond (compare diamond n.), by analogy, taking the d- of diamond n. (by an intentional false etymology) to represent either di- prefix¹ or duo- comb. form: compare polyabolo n., polyomino n., etc.

Geometry.

A planar shape formed by joining a number of identical equilateral triangles by their edges.

ΘΚΠ

the world > space > shape > angularity > specific angular shape > [noun] > triangle > figure made up of triangles > specific

polyabolo1967

polyiamond1967

1967 Sci. Amer. June 124/2 By joining equilateral triangles along their edges one obtains another well-explored family of shapes known as polyiamonds.

1975 Sci. Amer. July 114/3 Combinatorial geometers have given special attention in recent years to tiling with polyominoes and their cousins the polyiamonds and polyhexes.

1993 Amer. Math. Monthly Apr. 416 Figures formed not with unit squares but with equilateral triangles (polyiamonds) or regular hexagons (polyhexes).

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polyiamond
释义	polyiamondn. Brit. /ˌpɒlɪˈʌɪəmənd/, U.S. /ˌpɑliˈaɪ(ə)mən(d)/ Origin: Formed within English, by compounding. Etymons: poly- comb. form, diamond n. Etymology: < poly- comb. form + iamond (compare diamond n.), by analogy, taking the d- of diamond n. (by an intentional false etymology) to represent either di- prefix¹ or duo- comb. form: compare polyabolo n., polyomino n., etc. Geometry. A planar shape formed by joining a number of identical equilateral triangles by their edges. ΘΚΠ the world > space > shape > angularity > specific angular shape > [noun] > triangle > figure made up of triangles > specific polyabolo1967 polyiamond1967 1967 Sci. Amer. June 124/2 By joining equilateral triangles along their edges one obtains another well-explored family of shapes known as polyiamonds. 1975 Sci. Amer. July 114/3 Combinatorial geometers have given special attention in recent years to tiling with polyominoes and their cousins the polyiamonds and polyhexes. 1993 Amer. Math. Monthly Apr. 416 Figures formed not with unit squares but with equilateral triangles (polyiamonds) or regular hexagons (polyhexes). This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1967
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