trapezianadj.
Crystallography.
Having trapeziform lateral faces in two rows between the two bases, as a crystal of barium sulphate.In later dictionaries.
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secondary1816
trapezian1816
triacontahedral1816
tri-dodecahedral1816
tri-hexahedral1816
tri-octahedral1816
tri-rhomboidal1816
octodecimal1817
octoduodecimal1817
octosexdecimal1817
pentahexahedral1817
octahedrala1824
trigonal1878
pinacoidal1879
tetartopyramid1891
trisoctahedral1891
tetartohexagonal1895
tetartosystematic1895
1816 R. Jameson Treat. External Characters Minerals (ed. 2) 198 A crystal is said to be..Trapezian, when its lateral surfaces consist of trapezia, which lie in two rows, between two bases, as in trapezian heavy-spar... It is a rectangular four-sided table, bevelled on the extremities, where the bevelling planes are trapeziums.
1828 in N. Webster Amer. Dict. Eng. Lang.
1925 H. L. Mencken Let. 27 May in H. L. Mencken & S. Haardt Mencken & Sara (1987) 23 Prismatical, trapezian, or irregular.
This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2019).
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adj.1816