dīˈäpˌsīd, -_sə̇d noun
( -s )
Etymology: French, irregular from di- + Greek opsis appearance, sight — more at optic
: a pyroxene CaMgSi 2 O 6 that contains calcium and magnesium but little or no aluminum, that varies in color from white to green, and that when transparent is sometimes used in jewelry
• di·op·sid·ic |dīˌäp|sidik adjective