Etymology

nighty

N1I1G2H4T1Y4

Today it means: Good night; abbreviation of nighty night. Full definition →

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nighty · noun1

From night + -y (diminutive suffix).

nighty · phrase2

  1. Proto-Indo-European*nókʷts
  2. Proto-Germanic*nahts
  3. Proto-West Germanic*naht
  4. Proto-West Germanic*nahti
  5. Old Englishniht
  6. Middle Englishnyght
  7. Englishnight
  8. English todaynighty

From night + -y (suffix forming colloquialisms).

Etymology from Wiktionary, CC BY-SA 4.0.