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Synonyms
rap·id (răṕĭd)

[Latin rapidus, from rapere, to seize.]

adjective: -er, -est. 

Moving, acting, or occurring with great speed. See synonyms at fast1

noun 

An extremely fast-moving part of a river, caused by a steep descent in the riverbed. Often used in the plural.

derivatives

ra·pid́i·ty
noun
raṕid·ly
adverb