Cavern
来自Big Physics
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late Middle English: from Old French caverne or from Latin caverna, from cavus ‘hollow’. Compare with cave1.
wiktionary
From Middle English caverne, borrowing from Old French caverne, from Latin caverna(“hollow, cavity, cave”), from cavus(“hollow, excavated, concave”).
etymonline
cavern (n.)
"large, natural cave under the earth," late 14c., from Old French caverne (12c.) "cave, vault, cellar," from Late Latin caverna "cave," from Latin cavus "hollow" (from PIE root *keue- "to swell," also "vault, hole"). In Old English such a land feature might be called an eorðscræf.
