Strong's G1404 · Greek

δράκων

drakon · drak'-own

probably from an alternate form of derkomai (to look); a fabulous kind of serpent (perhaps as supposed to fascinate)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 13 δράκων , -οντος, ὁ [in LXX chiefly for תַּנִּין ;] a dragon , a mythical monster: fig., of Satan, Re 12:3-17 13:2 , 4 , 11 16:13 20:2 .† 

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