singlet

(siŋglit)

noun

  1. Brit. a man's undershirt, esp. a sleeveless one
  2. Austral., N.Z. a short-sleeved or sleeveless knit top, as a T-shirt or tank top
  3. any single thing that usually exists in combination; specif., an atom that is freed from combination by being raised to a higher energy level, as an atom of oxygen in a cell excited by a laser or sunlight, that becomes destructive

Origin: < single, modeled on doublet

See singlet in American Heritage Dictionary 4

noun
  1. Chiefly British A man's jersey undershirt.
  2. Physics A multiplet with a single member.

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