Abbott-Smith Manual Greek Lexicon
φόβητρον (G5400)
1 φόβητρον (LTr., WH, -θρον ), -ου, τό ( φοβέω ), [in LXX: Is 19:17 ( חָגָא ) * ;] that which causes fright, a terror : pl. (as always, exc. Is, l.c. ), Lk 21:11 (Hipp., Plat.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain