noun (plural coleorhizae /-zē/)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.
Mid 19th century: from koleos 'sheath' + rhiza 'root'.
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