rapid - Dictionary definition and pronunciation - Yahoo! Education
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rap·id  audio  (rpd) KEY 

ADJECTIVE:
rap·id·er, rap·id·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.
ETYMOLOGY:
Latin rapidus, from rapere, to seize; see rep- in Indo-European roots

OTHER FORMS:
ra·pidi·ty  (r-pd-t) KEY  or rapid·ness  (rpd-ns) KEY (Noun), rapid·ly(Adverb)


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