#1030 βρυγμός brugmos {broog-mos'}

 from G1031; TDNT - 1:641,110; n m

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) a gnashing of teeth
    1a) used to denote extreme anguish and utter despair of men
        consigned to eternal punishment in hell
 2) snarling, growling: in the sense of biting

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - gnashing 7; 7

—Exhaustive Concordance (KJV Translation Frequency & Location)