Cooked by exposure to steam or water vapor. Colloquially, it means very angry or irritated. Can also describe something cleaned or treated with steam.
From 'steam' (from Old English 'stēam', meaning vapor or exhalation) plus past participle suffix '-ed'. The cooking method has ancient origins, while the slang meaning of 'angry' developed in American English around the early 1900s, likely from the metaphor of steam building pressure.
Steaming as a cooking method preserves more nutrients than boiling because vitamins don't leach into water that's then discarded. Ancient Chinese cuisine perfected this technique over 2,000 years ago, developing specialized bamboo steamers that are still used today in dim sum restaurants worldwide.
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