A basophilic particle or structure in the cell cytoplasm, rich in RNA, often found in specialised cells. ... Origin: G. Chroma, colour, + -idion, a diminutive termination ... (05 Mar 2000) ... 
Type: Term Pronunciation: krō-mid′ē-ŭm, -ē-ă Definitions: 1. A basophilic particle or structure in the cell cytoplasm, rich in RNA, often found in specialized cells.