quadrihydraten.
/ˌkwɒdrᵻˈhʌɪdreɪt/, U.S. /ˌkwɑdrəˈhaɪˌdreɪt/ Chemistry. rare.
A compound containing four water molecules (or, formerly, hydroxide groups) in its empirical formula. Cf. tetrahydrate n. at tetra- comb. form 2a(c)(ii).
ΚΠ
1825 T. Thomson Attempt to Establish First Princ. Chem. II. 303 Berzelius considers it as a compound of 3 atoms carbonate of magnesia and of 1 atom of quadrohydrate.
1893 Philos. Trans. 1892 (Royal Soc.) A. 183 69 (table) Quadrihydrate of nitric acid.
1959 Analyt. Chem. 31 423/1 A solution of 2.76 grams of thorium nitrate quadrihydrate in 1000 ml. of water.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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n.1825