old maid
- n an elderly unmarried woman
- n any of various plants of the genus Zinnia cultivated for their variously and brightly colored flower heads
- n commonly cultivated Old World woody herb having large pinkish to red flowers
- n the loser in a game of old maid
- n 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')