Full of steam or hot moisture in the air; also used to describe something intense, romantic, or passionate.
From the noun 'steam' plus the adjective suffix '-y,' with steam itself coming from Old English and Germanic roots meaning 'vapor' or 'exhalation.'
The word 'steamy' has completely flipped meanings in modern language—it originally just described literal steam (like from a kettle), but now it's mostly used to describe passionate romance scenes in movies and books.
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