Webster's English Dictionary

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obtuse

Cross references:
  1. dull                  
 
ob.tuse \a:b-'t(y)u:s, *b-, 'a:b-.\ aj [L obtusus blunt, dull, fr. pp. of 
   obtundere to beat against, blunt], fr. ob- against + tundere to beat - more 
   at OB-, STUTTER 1: lacking sharpness or quickness of sensibility : 
   INSENSITIVE  of an angle  2a1: exceeding 90 degrees but less than 180 
   degrees  2a2: having an obtuse angle  2b: not pointed or acute : BLUNT  of 
   a leaf  2c: rounded at the free end  - ob.tuse.ly av