n.
Pronunciation: d ī - ' äp- ˌ s ī d
Function: noun
Etymology: French, from di- + Greek opsis appearance ― more at OPTIC
Date: circa 1808
: a green to white mineral that consists of pyroxene containing little or no aluminum
– di · op · sid · ic \ ˌ d ī - ˌ äp- ' si-dik \ adjective