protochloriden.
/ˌprəʊtə(ʊ)ˈklɔːrʌɪd/, U.S. /ˌproʊdoʊˈklɔˌraɪd/, /ˌproʊdəˈklɔˌraɪd/ Chemistry. Now rare.
A chloride which contains the smallest possible proportion of chlorine in relation to the other element (i.e. one in which the other element occurs in its lowest oxidation state). Cf. proto- comb. form 3a(a), perchloride n.
ΚΠ
1815 W. Henry Elements Exper. Chem. (ed. 7) I. i. xiv. 418 The different compounds of chlorine with one base, might have been designated in the way proposed by Dr. Thomson for the oxides, the first being called proto-chloride, the second deuto-chloride, and so of the rest.
1842 E. A. Parnell Elements Chem. Anal. (1845) 89 A solution of protochloride of tin containing a little perchloride of tin.
1922 Jrnl. Physical Chem. 26 452 The bichloride is not decomposed, as the protochloride is, by water.
1929 G. P. Merrill Minerals from Earth & Sky i. v. 66 The meteoric minerals found rarely, if ever, in terrestrial rocks are the various alloys of iron and nickel known as kamacite, taenite, and plessite;..the iron protochloride..merrillite; [etc.].
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1815