Webster's English Dictionary

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rapid

Cross references:
  1. fast                  
 
1. rap.id \'rap-*d\ aj [L rapidus seizing, sweeping, rapid, fr. rapere to 
   seize, sweep awa]y; akin to OE refsan to blame : marked by a fast rate of 
   motion, activity, succession, or occurrence :: SWIFT - rap.id.ly av
2. rapid n : a part of a river where the current is fast and the surface is 
   usu. brok en by obstructions - usu. used in pl. but sing. or pl. in constr.