Lewis Short
sĕgestre | sĕges-trĭa, ae | sĕ-gestra, ae (noun N.f.f) : n. (collat. form , , f., Varr. L. L. 5, § 166 Müll.: , , f., Edict. Diocl. p. 23)
* A covering, wrapper of straw or hides for shielding goods or persons from the weather: segestre, διφθέρα, διφθέρα πλοίου, Gloss. Vet.—Sing.: segestre, Lucil. ap. Non. 537, 10.—Plur., Varr. ap. Non. 11, 16; Plin. 13, 12, 23, § 76; Edict. Diocl. p. 23.—As a sort of mantle: segestri vel lodiculā involutus,Suet. Aug. 83.
Charlton T. Lewis, Charles Short, A Latin Dictionary