noun

• (informal) A small amount; a little bit.
• (US, slang, dated) A street boy; an urchin.
• A diminutive of the male given name Thaddeus or Thaddaeus.
• (UK, colloquial) Tadcaster.
• (uncountable) Initialism of tobacco, alcohol and drugs. [(uncountable) Any plant of the genus Nicotiana.]
• (countable, veterinary medicine) Initialism of transboundary animal disease.