adjective, fat·ti·er, fat·ti·est.

  1. consisting of, containing, or resembling fat: fatty tissue.
  2. Pathology. characterized by overproduction or excessive accumulation of fat.

noun, plural fat·ties. Informal.

  1. Disparaging and Offensive. a person who is overweight or obese (sometimes used as a term of address).
  2. a large marijuana cigarette, often shared and consumed by a group, with a shape and size similar to a cigar.

adjective -tier or -tiest

  1. containing, consisting of, or derived from fat
  2. having the properties of fat; greasy; oily
  3. (esp of tissues, organs, etc) characterized by the excessive accumulation of fat

noun plural -ties

  1. informal a fat person

late 14c., from fat + -y (2). As a name for a fat person, attested by 1797 (with -y (3)).


  1. Containing or composed of fat.
  2. Characteristic of fat; greasy.
  3. Derived from or chemically related to fat.

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