cationoidadj.

1925 A. Lapworth in Mem. & Proc. Manch. Literary & Philos. Soc. 69 p. xix Some ions..are shown to have some properties in common and are termed ‘cationoid’... [Some] have other properties in common and are termed ‘anionoid’.

1943 H. Gilman et al. Org. Chem. (ed. 2) II. xxv. 1859 The terms cationoid and anionoid..refer to the characteristic acceptor or donor activity of reactive cations or anions.

1953 C. K. Ingold Struct. & Mech. Org. Chem. v. 203 [Lapworth] likened all reagents either to anions or to cations: an ‘anionoid’ reagent was one which behaved analogously to an anion, or, as Robinson subsequently expressed it, to an ‘active’ anion; and a ‘cationoid’ reagent was one which behaved like a cation, or an active cation.