Webster's English Dictionary

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ream

1. ream \'re-m\ n [ME reme, fr. MF raime, fr. Ar rizmah, lit., bundle] 1: a 
   quantity of paper being 20 quires or variously 480, 500, or 516 sheets  2: 
   a great amount - usu. used in pl. 
2. ream vt [perh. fr. (assumed) ME dial. remen to open up, fr. OE dial. 
   re-man]; akin to OE ry-man to open up, ru-m roomy - more at ROOM 1a: to 
   widen the opening of (a hole) : COUNTERSINK  1b1: to enlarge or dress out 
   (a hole) with a reamer  1b2: to enlarge the bore of (as a gun) in this way  
   1c: to remove by reaming  2a: to press out with a reamer  2b: to press out 
   the juice of with a reamer