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Rigorous; severe; exacting; as, an ironclad oath or pledge. [Colloq.]

formed the main part of the navies of the world till about 1870, when the introduction of ironclads superseded them. [Formerly spelled frigat and friggot.]

Cased or covered with iron, as a vessel; ironclad.

idge along the middle of a flat or curved surface. Bilge keel (Naut.), a keel peculiar to ironclad vessels, extending only a portion of the length of the vessel under the bilges. Ham. Nav. Encyc. -- False keel. See under False. -- Keel boat. (a) A covered freight boat, with a keel, but no sails, used on Western river…

An ironclad war vessel, very low in the water, and having one or more heavily-armored revolving turrets, carrying heavy guns.

when the train is fired; a large port in an old-fashioned three-decker or a large modern ironclad.

s in a lathe. -- Turret lathe, a turning lathe having a turret head. -- Turret ship, an ironclad war vessel, with low sides, on which heavy guns are mounted within one or more iron turrets, which may be rotated, so that the guns may be made to bear in any required direction.