Abbott-Smith Manual Greek Lexicon
ἔθω (G1486)
4 ἔθω , pf. with pres. sense εἴωθα , [in LXX: Nu 24:1 ( כְּפַעַם־בְּפַעַם ), Da LXX Su 13 , Si 37:14 , IV Mac 1:12 * ;] to be accustomed, wont : Mt 27:15 , Mk 10:1 ; ptcp., τὸ εἰωθός , custom : κατὰ τὸ εἰ. (Nu, l.c.), Lk 4:16 , Ac 17:2 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain