Entry 1 sense Webster, 1913 Arsenide /är'sənīd/ · Ar·sen·ide · IPA /ˈaɹsəˌnaɪd/ 01 n. A compound of arsenic with a metal, or positive element or radical; -- formerly called arseniuret. 1. A compound of arsenic with a metal, or positive element or radical; -- formerly called arseniuret.(Chem.)