Of, relating to, or resembling the nature or characteristics of a fumarole or steam vent.
From 'fumarole' plus '-oid' (resembling) plus '-al' (relating to), creating a descriptive adjective for volcanic features.
Geologists use 'fumaroidal' to describe geological activity around volcanoes without being certain it's an actual fumarole—it's the scientific way of saying 'smoke-like and thermal' without committing!
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