tetrahedroidadj.n.
/tɛtrəˈhiːdrɔɪd//tɛtrəˈhɛdrɔɪd/ A. adj.
Resembling or approaching the form of a tetrahedron.
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the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > conical > pyramidal > tetrahedral
tetrahedral1794
tetrahedrical1860
tetrahedric1890
tetrahedrid1895
tetrahedroid1899
1899 Geogr. Jrnl. Mar. 251 Causes, which..would go in the direction of producing tetrahedral, or tetrahedroid, deformation.
B. n.
Geometry. The envelope of a quadric surface which touches eight given straight lines.
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the world > relative properties > number > geometry > surface > [noun]
superficec1400
superficies1530
surface1604
superficie1702
wave-surface1833
developable1847
quartic1854
scroll1862
conicoid1863
regulus1874
Riemann surface1876
tetrahedroid1889
construct1902
skew1902
trend surface1956
1889 Cayley's Math. Papers I. 587 (note) The surface here considered, the Tetrahedroid, is the general homographic transformation of the wave surface.
This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2018).
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adj.n.1889