Same entry in Photius (mu471 Theodoridis); cf. also Hesychius mu1455, and the scholia to Aristophanes, Acharnians 597, where the headword occurs (web address 1).
It is the last of three adjectives which take the form of mock patronymics there, at the end of lines 595, 596, and 597; in the mouth of the protagonist Dikaiopolis they contrast his own qualities (the first two: see, for both, under sigma 968) favourably with those of his interlocutor, the general Lamachus (lambda 81).