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