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speleologist

noun [C]
 
 
/ˌspiː.liˈɒl.ə.dʒɪst/ US  /-ˈɑː.lə-/ specialized

Definition

someone who studies caves, or who climbs in them for sportHiking and orienteeringCaves, cracks and crevices
(Definition of speleologist noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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