volcanic hole ( synonym found)
Definition of volcanic hole:

°Of or pertaining to a volcano or volcanoes; as, volcanic heat.
°Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.
Definition of volcanic hole:

°Of or pertaining to a volcano or volcanoes; as, volcanic heat.
°Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.
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