LSJ
ὁ, a deme of the Acamantian φυλή in Attica, Str. 9.1.20; Σφηττοῖ in or at Sphettos, Lys. 17.5, Aeschin. 1.97; Σφηττόθεν from S., IG1². 591, Plu. Thes. 13; Σφηττόνδε to S., St.Byz. ; — Σφήττιος, ὁ, a Sphettian, IG1². 304.20, Ar. Nu. 156, Aeschin. 1.100; also as Adj., ὄξος Σ. proverbial, Ar. Pl. 720, cf. Did. ap. Ath. 2.67d.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)