ˈniccolic,a.rare. [f.mod.L. niccol-um nickel.] Of nickel (see -ic 1 b). 1839Ure Dict. Arts 886 The niccolic suroxide has a dirty pale green colour.1857Mayne Expos.Lex. 765/2 Double salts produced by the combination of a niccolic with an ammonic salt.