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The Collaborative International Dictionary
Exorhiza

Exorhiza \Ex`o*rhi"za\ ([e^]ks`[-o]*r[imac]"z[.a]), n.; pl. Exorhiz[ae] (-z[=e]). [NL. fr. Gr. 'e`xw outside + 'ri`za root.] (Bot.) A plant Whose radicle is not inclosed or sheathed by the cotyledons or plumule.
--Gray.