old maid

名词noun

1. 1(derogatory) An old woman who has never married; a spinster.
2. 2The Madagascar periwinkle.
3. 3The common zinnia.
4. 4An unpopped kernel in a batch of popped popcorn kernels.
5. 5uncountableA card game in which cards must be paired and one unmatchable card is designated "old maid".
6. 6The unmatchable card in that game.