Webster's English Dictionary

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boulder

boul.der \'bo-l-d*r\ \-d*rd\ \-d(*-)re-\ n [short for boulder stone, fr. ME 
   bulder ston, part trans. of a word] of Scand origin; akin to Sw dial. 
   bullersten large stone in a stream, fr. buller noise + sten stone : a 
   detached and rounded or much-worn mass of rock  - boul.dered aj