Entry 1 sense Webster, 1913 Cyanide /(s?"?-n?d [or] -n?d; 104)/ · Cy·a·nide · IPA /ˈsaɪənaɪd/ 01 n. A compound formed by the union of cyanogen with an element or radical. 1. A compound formed by the union of cyanogen with an element or radical.(Chem.)