- informal
short for nightdress
WordReference Random House Learner's Dictionary of American English © 2026
WordReference Random House Unabridged Dictionary of American English © 2026
night•ie
(nī′tē),USA pronunciation n. [Informal.]
- Clothinga nightgown.
- night(gown) + -ie 1890–95
Collins Concise English Dictionary © HarperCollins Publishers::
nightie, nighty /ˈnaɪtɪ/ n ( pl nighties)