pyramoid Geom. rare—0.
(ˈpɪrəmɔɪd)
[ad. Gr. πῡραµοειδής pyramid-shaped, f. πῡραµίς pyramid: see -oid.]
= pyramidoid (Webster 1864). So pyraˈmoidal a. = pyramidoidal b.
| 1883 Heddle in Encycl. Brit. XVI. 354/2 Producing..in the hexagonal system ‘pyramoidal’ and ‘gyroidal’ forms. |