Entry 1 sense Webster, 1913 Cyamelide /(sī̇*ăm"ē̇*lĭd [or] -līd; 104)/ · Cy·am·e·lide · IPA 01 n. A white amorphous substance, regarded as a polymeric modification of isocyanic acid. 1. A white amorphous substance, regarded as a polymeric modification of isocyanic acid.(Chem.)