Word Summary
drakōn: a dragon (a mythical monster)
Original Word: δράκων
Transliteration: drakōn
Phonetic Spelling: (drak'-own)
Part of Speech: Noun, Masculine
Short Definition: a dragon (a mythical monster)
Meaning: a dragon (a mythical monster)
Strong's Concordance

Probably from an alternate form of derkomai (to look); a fabulous kind of serpent (perhaps as supposed to fascinate) -- dragon.

Thayer's Greek Lexicon
STRONGS NT 1404: δράκων

δράκων, δράκοντος, (apparently from δέρκομαι, 2 aorist ἔδρακον; hence, δράκων, properly, equivalent to ὀξύ βλέπων (Etym. Magn. 286, 7; cf. Curtius, § 13)); the Sept. chiefly for תָּנִּין; a dragon, a great serpent, a fabulous animal (so as early as Homer, Iliad 2, 308f, etc.). From it, after Genesis 3:1ff, is derived the figurative description of the devil in Revelation 12:3-17; Revelation 13:2, 4, 11; Revelation 16:13; Revelation 20:2. (Cf. Baudissin, Studien zur semitisch. Religionsgesch. vol. i. (iv. 4), p. 281ff.)