coleorhiza

co·le·o·rhi·za

[koh-lee-uh-rahy-zuh, kol-ee-]
noun, plural co·le·o·rhi·zae [-zee] . Botany.
the sheath that envelops the radicle in certain plants and that is penetrated by the root in germination.

Origin:
1865–70; < Neo-Latin < Greek koleó(n) sheath, scabbard + rhíza root1

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coleorhiza (ˌkɒlɪəˈraɪzə) [Click for IPA pronunciation guide]
 
n , pl -zae
a protective sheath around the radicle in grasses
 
[C19: from New Latin, from Greek koleon sheath + rhiza root]

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Coleorhiza is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
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