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In aeronautics, a plane covered on both the upper and under sides of the ribs. Doublet — An under-garment of linen, slightly quilted and having; rings of mail under the breast-plate and under the knees and arms, so as to protect the body where the armor was weakest and wherever an opening might occur for the sword or poniard. Double each Redan. other. — Two redans placed side by side and joined to Double Sap. — Two heads of sap pushed forward by two brigade working Its object to form exposed to a breast. fire in front and on is both sides.a trench in a position1 Double Skell. — A shell used in the 7-inch English rifles. It 1 27 inches long and to strengthen it against outside pre ure, it has three internal longitudinal ribs projecting about an inch into the cavity of the shell.