cryohydraten.
/krʌɪə(ʊ)ˈhʌɪdreɪt/, U.S. /ˌkraɪoʊˈhaɪˌdreɪt/ Chemistry. Now rare.
A solid substance having a distinct composition and melting point formed by the combination of a salt or other crystalline compound with water (ice) at a temperature below freezing. Cf. eutectic n. 1.
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the world > matter > chemistry > chemical reactions or processes > [noun] > chemical reactions or processes (named) > hydration > a hydrate > a solid hydrate
melanterite1814
cryohydrate1875
1875 F. Guthrie in London, Edinb., & Dublin Philos. Mag. 4th Ser. 49 12 It is an essential element in the existence of these compounds that they can only exist in the solid state below 0° C. Hence I propose to call them for the present ‘cryohydrates’.
1912 S. L. Bigelow Theoret. & Physical Chem. xxiv. 343 Cryohydrates have definite melting points, one of the characteristic properties of chemical compounds, but of course they are not chemical compounds.
1964 G. W. Castellan Physical Chem. xv. 299 The eutectic mixture was originally thought to be a compound. In aqueous systems, this ‘compound’ was called a cryohydrate.
2008 Electrochimica Acta 53 4415/2 The impedance was measured..from −30°C to −60°C using a cryohydrate bath or oil bath.
Compounds
cryohydrate point n. = cryohydric point n. at cryohydric adj.
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1899 Jrnl. Soc. Chem. Industry 31 Mar. 273/2 The curves of solubility show a general similarity... At the ‘cryohydrate point’ this is cut by the curve of the hydrate with 9H2O.
1921 A. M. Comey & D. A. Hahn Dict. Chem. Solubilities (ed. 2) 1120/2 (table) Solubility in H2O... Cryohydrate point... Transition point... Mpt... Eutectic point.
1997 U.S. Patent 5,679,645 5 The period of time for the solution to be completely frozen was determined from the cryohydrate point.
This entry has been updated (OED Third Edition, June 2011; most recently modified version published online March 2022).
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n.1875