We found one dictionary that defines the word rate of flows:

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1. rate of flows: Collins English Dictionary

(Note: See rate_of_flow as well.)

Definitions from WordNet (rate of flow) ▸ noun:  the amount of fluid that flows in a given time ▸ Also see rate_of_flow ▸ Words similar to rate of flows ▸ Usage examples for rate of flows ▸ Idioms related to rate of flows ▸ Wikipedia articles (New!) ▸ Words that often appear near rate of flows ▸ Rhymes of rate of flows ▸ Invented words related to rate of flows