malapropism /malˈə-pro-pi-zm/

1. The misapplication of words without mispronunciation, from Mrs Malaprop in Sheridan's play, The Rivals, who uses words malapropos
2. A word so used

• astrocyte
• astrocytes
• astrocytoma
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• astrodome
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• astrodynamicist
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• astrofell
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• astroid
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• astrologer
• astrologers