Strong's G5059 · Greek

τέρας

teras · ter'-as

of uncertain affinity; a prodigy or omen

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 16 τέρας , -ατος, τό [in LXX chiefly for מוֹפֵת ;] a wonder, marvel : in NT always pl., τ. κ. σημεῖα , Mt 24:24 , al. (v.s. σημεῖον ) 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain