WordReference Random House Unabridged Dictionary of American English © 2020
spe•lae•an  (spi lēən),USA pronunciation adj. 
  1. of, pertaining to, or inhabiting a cave or caves.
Also,  spe•lean. 
  • Greek spé̄laion) + -an
  • Neo-Latin spēlae(us) (adjective, adjectival derivative of Latin spēlaeum cave
  • 1830–40

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