Lewis & Short

bŏthȳnus, i, m., = βόθυνος, a fiery meteor in the form of a pit: sunt bothynoe (acc. to the Gr. form = bothyni, like adelphoe, arctoe, etc.) cum velut coronā cingente introrsus ingens caeli recessus est similis effossae in orbem speluncae. Sen. Q. N. 1, 14, 1 (Haas. as Greek); App. de Mundo, pp. 58 and 64.