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orthodiagonal
orthodiagonal n. and adj. 
/ˌɔːθə(ʊ)dʌɪˈaɡn̩l/,
Brit. /ˌɔːθə(ʊ)dʌɪˈaɡ(ə)nl/
, /ˌɔːθə(ʊ)dʌɪˈaɡ(ə)nl//ˌɔːθə(ʊ)dʌɪˈaɡn̩l/U.S. /ˌɔrθoʊˌdaɪˈæɡən(ə)l/
Crystallography (a) n. the axis in the monoclinic system that is perpendicular to both the other axes; (b) adj. belonging to or in the line of this axis (cf. clinodiagonal n. at clino- comb. form 2)./ˌɔrθoʊˌdaɪˈæɡən(ə)l/ΘΚΠ
the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > [adjective] > relating to axis of symmetry
orthodiagonal1854
the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > [noun] > axis of symmetry > having two > the lateral axis in the monoclinic system
orthodiagonal1854
1854 J. D. Dana Syst. Mineral. (ed. 4) I. i. ii. 44 The vertical axis a is oblique to b, the clinodiagonal, but at right angles with c, the orthodiagonal.
1854 J. D. Dana Syst. Mineral. (ed. 4) I. i. ii. 86 Let the inclination of +1 on the clinodiagonal section be designated by X; on the orthodiagonal section by Y.
1879 F. Rutley Study of Rocks ix. 80 Sections lying in the zone of the orthodiagonal.
1922 A. E. H. Tutton Crystallogr. xvi. 249 The symmetry axis b, being at right angles to the vertical axis, is termed the ‘ortho-diagonal’ for discipline purposes, and the axis a because inclined to the vertical axis c, is called the ‘clino-diagonal’.
1927 Proc. Royal Soc. A. 114 225 In the space-groups based on Γm, the planes which may be halved are {010}, and planes of the orthodiagonal zone {h0l}.
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