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polyacron
polyacron n. 
/ˌpɒlɪˈakr(ə)n/, /ˌpɑliˈækrən/ (plural polyacrons, polyacra) [ < poly- comb. form + ancient Greek ἄκρον summit, use as noun of neuter of ἄκρος highest, topmost (see acro- comb. form)] Geometry rare a solid figure having many vertices; a polyhedron (classified according to the number of its vertices).
Brit. /ˌpɒlɪˈakrɒn/
, /ˌpɒlɪˈakrɒn//ˌpɒlɪˈakr(ə)n/U.S. /ˌpɑliˈæˌkrɑn/
, /ˌpɑliˈæˌkrɑn//ˌpɑliˈækrən/ΘΚΠ
the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > polyhedron
polyhedron1570
pyritohedron1841
polyacron1862
1862 Mem. Literary & Philos. Soc. Manch. 3rd Ser. 1 249 A method for the derivation of the ∆ faced polyacrons of a given number of summits from those of the next inferior number of summits.
1929 D. M. Y. Sommerville Introd. Geom. N Dimensions vii. 102 To distinguish between a polytope considered with respect to its faces and its vertices, we may call it in the latter case a polycorypha. [Note] Cayley uses the term polyacron.
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