blue hole

noun

A submarine cave or sinkhole, a roughly circular, steep-walled depression that is typically anoxic below a certain depth.

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Meanings

nounblue hole (plural blue holes)

plural blue holes

  1. A submarine cave or sinkhole, a roughly circular, steep-walled depression that is typically anoxic below a certain depth.
Cite this entry
APA

blue hole. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/blue%20hole

MLA

“blue hole.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/blue%20hole. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “blue hole,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/blue%20hole.

Source: blue hole on Wiktionary, CC BY-SA 4.0.