Perhaps a primary word; a (male) paramour; figuratively, apostate -- adulterer.
Thayer's Greek Lexicon
Strong's 3432: μοιχός
μοιχός, μοιχοῦ, ὁ, an adulterer: Luke 18:11; 1 Corinthians 6:9; Hebrews 13:4. Hebraistically (see μοιχαλίς, b.) and figuratively, faithless toward God, ungodly: James 4:4 R G. (Sophocles, Aristophanes, Xenophon, Plutarch, and following; the Sept..)
Luke 18:11 - N-NMP GRK:ἅρπαγες ἄδικοι μοιχοί ἢ καὶ NAS: swindlers, unjust, adulterers, or even KJV: unjust, adulterers, or INT: swindlers unrighteous adulterers or even
1 Corinthians 6:9 - N-NMP GRK:εἰδωλολάτραι οὔτε μοιχοὶ οὔτε μαλακοὶ NAS: nor adulterers, nor KJV: nor adulterers, nor INT: idolaters nor adulterers nor effeminate
Hebrews 13:4 - N-AMP GRK:γὰρ καὶ μοιχοὺς κρινεῖ ὁ NAS: for fornicators and adulterers God KJV: and adulterers God INT: however and adulterers will judge
