单词	coleorhiza
释义	coleorhiza /ˌkɒlɪə(ʊ)ˈrʌɪzə / noun (plural coleorhizae /ˌkɒlɪə(ʊ)ˈrʌɪziː/) Botany A sheath protecting the root of a germinating grass or cereal grain.Indeed, at the end of stage II, scutellum, coleoptile, coleorhiza, primary root primordium, and leaf primordia have already been reported to be present.... Seminal roots do not form a coleorhiza since the scutellar node tissue is already differentiated when seminal roots emerge and can easily be penetrated. Longitudinal sections of the embryonic root showed that the structures that protect the rootlet, i.e. the root-cap and coleorhiza, were strongly labelled. Origin Mid 19th century: from koleos 'sheath' + rhiza 'root'.
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