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Adjective: rapid (rapider,rapidest)  ra-pid
  1. Done or occurring in a brief period of time
    "a rapid rise through the ranks"
     
  2. Characterized by speed; moving with or capable of moving with high speed
    "a rapid movement";
    - speedy
Noun: rapid  ra-pid
  1. A part of a river where the current is very fast

Derived forms: rapids, rapider, rapidest

See also: fast

Type of: waterway

Part of: river

Encyclopedia: Rapid