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 (kō′lē-ə-rī′zə, kŏl′ē-)
n. pl. co·le·o·rhi·zae (-zē)
A protective sheath enclosing the embryonic root of grasses.

[New Latin : Greek koleon, sheath; see kel- in Indo-European roots + Greek rhiza, root; see wrād- in Indo-European roots.]


(ˌkɒlɪəˈraɪzə) or


n, pl -zae (-ziː)
(Botany) a protective sheath around the radicle in grasses
[C19: from New Latin, from Greek koleon sheath + rhiza root]


(ˌkoʊ li əˈraɪ zə, ˌkɒl i-)

n., pl. -zae (-zē).
the sheath that encloses the primary root in embryonic grasses.
[1865–70; < New Latin < Greek koleó(n) sheath, scabbard + rhíza root1]
References in periodicals archive ?
Stevenson (1990, page 20), however, is of the opinion that a tree coleorhiza is unique to the grasses and that cycads do not have a true coleorhiza.
The question now arises whether this structure should be called a coleorhiza or something else.
Homology of the Coleorhiza of Cycad and Grass Embryos
This study investigates cold responses of Ot220 and America during seed germination, at the phases of coleorhiza (1-2 mm elongation) and radicle (10 mm elongation) emergence, and compares these responses with those reported for later developmental stages of these cultivars.
A seed with a visible coleorhiza was considered germinated.
The root apex is initially covered by a coleorhiza, and the