old maid

noun

1. an elderly unmarried woman
2. any of various plants of the genus Zinnia cultivated for their variously and brightly colored flower heads
3. commonly cultivated Old World woody herb having large pinkish to red flowers
4. the loser in a game of old maid
5. a card game using a pack of cards from which one queen has been removed; players match cards and the player holding the unmatched queen at the end of the game is the loser (or ‘old maid’)