Webster's English Dictionary

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sty

1. sty \'sti-\ n or sties also styes [ME, fr. OE stig; akin to ON -sti- 
   sty] pl  1: a pen or enclosed housing for swine  2: a filthy, low, or 
   vicious place 
2. sty vb or stied;  or sty.ing : to lodge or keep in or as if in a sty  : 
   to live in a sty 
3. sty or stye \'sti-\ n or sties or styes [short for obs. E styan, fr. 
   (assumed) ME, alter. of OE sti-gend] pl , fr. sti-gan to go up, rise - more 
   at STAIR : an inflamed swelling of a sebaceous gland at the margin of an 
   eyelid