Definition of spelunker in English:

spelunker

noun

North American
  • See spelunking

    • ‘Avid spelunkers may spend days or even weeks underground finding connections between vast underground cave systems.’
    • ‘Long ago, when I was an active spelunker, it had occurred to me that radiocarbon techniques ought to be applicable to the dating of secondary deposits in limestone caves.’
    • ‘For spelunkers, Natural Bridge Caverns offers some of the best commercial caving in Texas.’
    • ‘The grotto members are not spelunkers; they are ‘cavers.’’
    • ‘‘We are spelunkers, examining stalagmites today,’ Susie tells me, concentrating on the rock formation at her feet.’

Pronunciation

spelunker

/spɪˈlʌŋkə/