• Bengali Word পৈশাচ English definition (adjective) relating/belonging to the Pisachas (পিশাচ); demon-like; infernal; ghoulish; monstrous; fiendish. পৈশাচী (feminine) = পৈশাচ. (noun) the eighth or lowest from of Hindu marriage (when a lover secretly embraces a damsel either sleeping or intoxicated or disordered in her intellect).