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envelope |
Also found in: Dictionary/thesaurus, Medical, Financial, Acronyms, Idioms, Wikipedia, Hutchinson | 0.03 sec. |
envelope(1) A range of frequencies for a particular operation. envelope 1. Biology any enclosing structure, such as a membrane, shell, or skin 2. the bag enclosing the gas in a balloon 3. Maths a curve or surface that is tangent to each one of a group of curves or surfaces 4. Electronics the sealed glass or metal housing of a valve, electric light, etc. 5. Telecomm the outer shape of a modulated wave, formed by the peaks of successive cycles of the carrier wave |
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The outer envelope might then be cast off as a useless encumbrance; and the second balloon, left free to itself, would not offer the same hold to the currents of air as a half-inflated one must needs present. Then he took the envelope itself, held it up to the light, and very carefully studied both the exterior and the flap. Robert returned, and waited near his mistress, with the directed envelope in his hand. |
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