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1. dated A disparaging term for an older, unmarried woman. She had a few suitors in her youth, but now Edna is an old maid. My parents are pressuring me to get married—they don't want any of their daughters to become an old maid.
2. A fussy, prudish person. You better make sure the place settings are perfect, what with the old maid coming to dinner tonight.
3. A card game in which players pair matching cards and try to avoid being the last one holding the only card with no mate, dubbed the "old maid." When my kids were little, they loved playing old maid.