Abbott-Smith Manual Greek Lexicon
φυλακή (G5438)
47 φυλακή , -ῆς, ἡ ( φυλάσσω ) [in LXX chiefly for מִשְׁמֶרֶת and cogn. forms, also for כֶּלֶא etc. ;] actively, a guarding, guard, watch (Hom., Plat., Xen., al.): cogn. acc., φυλάσσειν φυλακάς , to keep watch , Lk 2:8 ; of those who keep watch (as also Lat. custodia ), a guard ; pl., sentinels, a guard (Hom., al.): Ac 12:10 ; of the place where persons are kept under guard, a prison (Hdt., Thuc., al.): Mt 14:10 , Mk 6:17 , Lk 3:20 , Ac 5:19 , II Co 6:5 , I Pe 3:19 , Re 18:2 , al.; of the time during which guard was kept by night (Lat. vigilia; Anthol.), a watch : Mt 14:25 24:43 , Mk 6:48 , Lk 12:38
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain