M / Mūsēum
noun

Mūsēum

gen. Mūsei · gender neuter · decl. 2nd
and , , , = Μουσεῖον
a seat of the muses, a museum;; a library, academy, study; a grotto
a seat of the muses, a museum; a place for learned occupations, a library, academy, study, Varr. R. R. 3, 5, 9; Suet. Claud. 42; Spart. Hadr. 20; a grotto, Plin. 36, 21, 42, § 154.