Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Multi-word Results
rapid eye movement the rapid back-and-forth and up-and-down movements of the eyes during the phases of sleep when dreaming occurs. (abbrev.:REM)
rapid transit a system of metropolitan public transportation, such as a subway, that uses elevated and underground electric trains moving quickly and unimpeded through the city.
rapid-fire of guns, designed to fire shots in rapid succession. [2 definitions]