cave

A cave is hollow space underground that's big enough for a person to walk or crawl into. People who explore caves often wear battery-powered headlamps.

You might see a small cave in the side of a cliff as you hike up a mountain, or swim into an underwater cave when you go snorkeling. In either case, a cave is a deep, carved-out chamber that opens above ground — or in the water. People who regularly explore caves are called spelunkers, or cavers. The Latin root word is cavea, "hollow."

Definitions of cave
  1. noun
    a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea
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    examples:
    Fingal's Cave
    a large cave with basaltic pillars on Staffa island in Scotland
    Lascaux
    a cave in southwestern France that contains Paleolithic paintings
    types:
    cavern
    a large cave or a large chamber in a cave
    cove
    small or narrow cave in the side of a cliff or mountain
    grot, grotto
    a small cave (usually with attractive features)
    type of:
    formation, geological formation
    (geology) the geological features of the earth
  2. verb
    hollow out as if making a cave or opening
    “The river was caving the banks”
    synonyms: undermine
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    types:
    sap
    excavate the earth beneath
    type of:
    core out, hollow, hollow out
    remove the interior of
  3. verb
    explore natural caves
    synonyms: spelunk
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    type of:
    explore
    travel to or penetrate into
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