From 'atar; shut up, i.e. Impeded (as to the use of the right hand) -- + left-handed.
see HEBREW 'atar
H334. itter
אִטֵּר adjective shut up, bound (Late Hebrew אִטֵּר, lame) א ׳אִישׁ יַדיְֿמִינוֺ Judges 3:15; 20:16 a man bound, restricted, as to his right hand, i.e. left-handed.