† pyramoidaladj.
Geometry. Obsolete. rare.
= pyramidoidal adj. 1.
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the world > space > shape > angularity > specific angular shape > [adjective] > triangular > pyramidal or triangular in section
pyramidalc1450
trigonal1571
pyramidate1572
pyramidical1599
pyramidy1627
pyramical1633
triangular1644
pyramidated1745
triquetrous1752
trihedral angle1789
pyramoidal1883
the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > conical > pyramidal
pyramidalc1450
pyramidate1572
pyramidical1599
pyramidy1627
pyramical1633
pyramidoidal1807
pyramoidal1883
1883 Encycl. Brit. XVI. 354/2 Producing..in the hexagonal system ‘pyramoidal’ and ‘gyroidal’ forms.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online June 2018).
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adj.1883