Webster's English Dictionary

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nut

1. nut \'n*t\ \-.li-k\ n [ME nute, note, fr. OE hnutu; akin to OHG nuz nut, 
   L Xnux 1a1: a hard-shelled dry fruit or seed with a separable rind or shell 
   and in terior kernel 1a2: the kernel of a nut  1b: a dry indehiscent 
   one-seeded fruit with a woody pericarp  2: something resembling a nut in 
   the difficulty it presents; esp :  a hard problem or undertaking 3: a 
   perforated block usu. of metal that has an internal screw thread and i s 
   used on a bolt or screw for tightening or holding something 4: the ridge in 
   a stringed musical instrument over which the strings pass o n the upper end 
   of the fingerboard pl  5: NONSENSE - often used interjectionally  slang  6: 
   a person's head  7a: a foolish, eccentric, or crazy person  7b: ENTHUSIAST  
   8: EN 2  - nut.like aj
2. nut vi or nut.ted;  or nut.ting : to gather or seek nuts