Definition of fluvio- in English:

fluvio-

Pronunciation: /ˈfluːvɪəʊ/

combining form

River; relating to rivers: fluvioglacial

Origin

from Latin fluvius 'river'.

Definition of fluvio- in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal