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tetartohedrism
tetartohedrism n. 
/tɛˌtɑːtə(ʊ)ˈhiːdrɪz(ə)m/, /tɛˌtɑrdoʊˈhiˌdrɪz(ə)m/ the property or quality of crystallizing in tetartohedral forms; the condition in which a crystal symmetrically develops only one fourth of the number of planes demanded by holohedral symmetry.
Brit. /tᵻˌtɑːtə(ʊ)ˈhiːdrɪz(ə)m/
, /tᵻˌtɑːtə(ʊ)ˈhiːdrɪz(ə)m//tɛˌtɑːtə(ʊ)ˈhiːdrɪz(ə)m/U.S. /təˌtɑrdoʊˈhiˌdrɪz(ə)m/
, /təˌtɑrdoʊˈhiˌdrɪz(ə)m//tɛˌtɑrdoʊˈhiˌdrɪz(ə)m/ΘΚΠ
the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [noun] > tetartohedrism
tetartohedrism1854
tetartohedry1864
1854 J. D. Dana Min. (ed. 4) I. 49 A form of this kind..is found in Titanic Iron, and is called rhombohedral tetartohedrism.
1895 N. Story-Maskelyne Crystallogr. 160 The ambiguity in which the terms hemihedrism, tetartohedrism, etc. are involved.
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