clausūra

ae, f.

claudo

I. (Cf. claustra, I. A.) A lock, bar, bolt, Inscr. Orell. 2510.—
II. (Cf. claustra, II. B.) A castle, fort (late Lat.), Cod. Just. 1, 27, 2, § 4; Cassiod. Var. 2, 5.
Lewis & Short
A Latin Dictionary, 1879
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