From nachash; an incantation or augury -- enchantment.
see HEBREW nachash
H5173. nachash
נַ֫חַשׁ noun [masculine] divination, enchantment, only absolute ׳נ Numbers 23:23 (J E; "" קֶסֶם), and plural absolute נְחָשִׁים 24:1 (JE), both in story of Balsam.
III. נחשׁ (√ of following, meaning unknown).