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tripyramid
tripyramid n.
Brit. 
/(ˌ)trʌɪˈpɪrəmɪd/
, /(ˌ)trʌɪˈpɪrəmɪd/U.S. /ˌtraɪˈpɪrəˌmɪd/
Crystallography a triangular pyramid, as a form in certain calcareous spars. [After scientific Latin Tripyramides, genus name (1748 or earlier).] /ˌtraɪˈpɪrəˌmɪd/ΘΚΠ
the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [noun]
tripyramid1828
trisoctahedron1837
fluoroid1850
sphenoid1855
discalenohedron1872
prism1878
tetrakis-hexahedron1878
galenoid1882
macroprism1883
semi-form1895
tetartohedron1895
tetrakisdodecahedron1895
trichite1900
1753 Chambers's Cycl. Suppl. Tripyramides,..the name of a genus of spars... The bodies of this genus are spars, composed of single pyramids, each of three sides,..affixed by their bases to some solid body.]
1828 N. Webster Amer. Dict. Eng. Lang. Tripyramid.
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