Of or relating to vapor, steam, or the gaseous state; having the nature or characteristics of vapor.
From Greek atmis (vapor, steam) with the adjectival suffix '-id,' derived from the Latin '-idus.' The root atmis refers to visible moisture or steam rising from water.
The 'atm' root in atmid is the same one that gives us 'atmosphere'—literally 'sphere of vapor'—which is why old meteorologists used atmid to describe anything steamy or misty.
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