Extremely hot and dry; can also mean passionate or intense, especially referring to a romantic or sexual relationship.
From Latin 'torridus' (dried by heat), from 'torrere' (to scorch). Originally used in geography to describe the hottest regions of Earth, then metaphorically applied to emotions.
The Torrid Zone was what Renaissance geographers called the area around the equator—they actually thought people couldn't live there because it would be unlivable, but it's home to billions!
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