Princeton's WordNet

1. spinster, old maid(noun)

   an elderly unmarried woman

2. zinnia, old maid, old maid flower(noun)

   any of various plants of the genus Zinnia cultivated for their variously and brightly colored flower heads

3. periwinkle, rose periwinkle, Madagascar periwinkle, old maid, Cape periwinkle, red periwinkle, cayenne jasmine, Catharanthus roseus, Vinca rosea(noun)

   commonly cultivated Old World woody herb having large pinkish to red flowers

4. old maid(noun)

   the loser in a game of old maid

5. old maid(noun)

   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')

Wiktionary

1. Old Maid(Noun)

   A children's card game, sometimes played with a special deck, where the object of the game is for each player to find matches for all the cards in his hand, without being stuck with the single unmatchable card.

2. Old Maid(Noun)

   The unmatchable card itself.

3. old maid(Noun)

   An old woman who has never married; a spinster.

4. old maid(Noun)

   A particular kind of periwinkle.

5. old maid(Noun)

   A particular kind of zinnia.

6. old maid(Noun)

   A card game in which cards must be paired and one undesirable card is designated "old maid".

7. old maid(Noun)

   An unpaired card in that game.

The Roycroft Dictionary

1. old maid

   A lady of uncertain age and uneasy virtue.

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