peloidaladj.
/pᵻˈlɔɪdl/, U.S. /pəˈlɔɪd(ə)l/ 1. Of or relating to substances used in pelotherapy (cf. peloid n. 1). rare.
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the world > the earth > minerals > mineral structure or appearance > [adjective] > crystalline > specific crystal
idiomorphic1887
automorphic1888
hypidiomorphic1888
euhedral1906
idioblastic1908
peloidal1933
1933 S. J. Lewis in Arch. Med. Hydrol. 11 182/1 Peloid..is applicable in all languages in the same way as colloid or alkaloid, giving plurals and adjectives (e.g. ‘peloidal’) to the same models.
2. Geology. Relating to or consisting of minute particles of microcrystalline or cryptocrystalline carbonate (cf. peloid n. 2).
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1969 E. D. McKee & R. C. Gutschick in Mem. Geol. Soc. Amer. 114 555 Peloidal limestone is defined as rock composed dominantly of particles of cryptocrystalline or microcrystalline material, commonly ovoid in shape.
1976 Nature 20 May 221/2 A thin oncolitic iron formation is interbedded with peloidal and oolitic ferruginous chert.
2000 Oil & Gas Jrnl. (Nexis) 19 June 40 This photomicrograph displays a porous, peloidal grainstone sample of the Sulaiy formation before it was subjected to diluted bentonite water-base mud.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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adj.1933