Webster's English Dictionary

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grease

1. grease \'gre-s\ n [ME grese, fr. OF craisse, graisse, fr. (assumed) VL 
   crass]ia, fr. L crassus fat 1a: rendered animal fat  1b: oily matter  1c: a 
   thick lubricant  2: wool as shorn and before cleansing  of wool or fur  : 
   in the natural uncleaned condition  - in the grease 
2. grease or grease the palm \'gre-s, 'gre-z\ vt 1: to smear or daub with 
   grease  2: to lubricate with grease  3: to soil with grease  : BRIBE  - 
   greas.er n