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subterrane

[suhb-tuh-reyn, suhb-tuh-reyn]
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noun
  1. a cave or subterranean room.
Also sub·ter·rain, sub·ter·rene [suhb-tuh-reen, suhb-tuh-reen] /ˈsʌb təˌrin, ˌsʌb təˈrin/.

Origin of subterrane

1605–15, in sense “subterranean”; 1765–75 for current sense; < Latin subterrāneus subterranean, equivalent to sub- sub- + terr(a) earth + -āneus composite adj. suffix, equivalent to -ān(us) -an + -eus -eous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018