Abbott-Smith Manual Greek Lexicon
κραταιόω (G2901)
4 † κραταιόω , -ῶ (late form of κρατύνω ; κράτος ), [in LXX chiefly for חזק ;] to strengthen ; pass., to wax strong : Lk 2:40 , I Co 16:13 ; πνεύματι , Lk 1:80 ; δυνάμει κ. διὰ τ. πνεύματος , Eph 3:16 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain