Zinggn.
/tsɪŋ/, /zɪŋ/, U.S. /tsɪŋ/, /zɪŋ/ Geology.
As a modifier. Used with reference to Theodor Zingg's system of classification of pebble shapes, in which two ratios formed from three mutually perpendicular diameters are used to assign a pebble to one of four basic shape classes according to its degree of flatness and elongation.
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1939 Jrnl. Sedimentary Petrol. 9 128/1 (caption) Relation between Zingg's pebble classes and the index of elongation.]
1941 Jrnl. Sedimentary Petrol. 11 67/1 (heading) Relation between sphericity and Zingg shape classes.
1979 Nature 8 Feb. 496/3 Very simple probabilistic methods were used to estimate the formation of the four basic Zingg shapes (disks, spheres, blades and rods).
2009 Estuaries & Coasts 32 334/2 The Zingg diagram reflects the sphericity of the pebbles in the deposit.
This entry has been updated (OED Third Edition, March 2021; most recently modified version published online March 2022).
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n.1941