Definition of rhizo- in English:

rhizo-

Pronunciation: /ˈrʌɪzəʊ/

combining form

Botany
Relating to a root or roots: rhizomorph

Origin

from Greek rhiza 'root'.

Definition of rhizo- in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…