heptahedronn.
/hɛptəˈhiːdrən//hɛptəˈhɛdrən/ A solid figure having seven faces.
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1696 E. Phillips New World of Words (new ed.) Heptaedrical Figure, or Heptaedron.
1804 Watt in Philos. Trans. (Royal Soc.) 94 310 (note) Hexaedral and pentaedral prisms are most abundant; then the tetraedral, the triedral, heptaedral, and octaedral.
Derivatives
heptaˈhedral adj.
ΘΚΠ
the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > heptagonal
heptagonal1612
septilateral1650
septangular1656
heptahedrical1658
septangled1702
heptangular1706
septagon1756
heptahedral1758
1758 W. Borlase Nat. Hist. Cornwall ii. §17. 141 A heptahedral cuspis of brass-coloured Mundic.
ΘΚΠ
the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > heptagonal
heptagonal1612
septilateral1650
septangular1656
heptahedrical1658
septangled1702
heptangular1706
septagon1756
heptahedral1758
1658 E. Phillips New World Eng. Words Heptahedrical, having seven sides.
This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2021).
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n.1658