Толковый словарь английского языка Oxford English Reference - envelope
Envelope
envelope
n. 1 a folded paper container, usu. with a sealable flap, for a letter etc. 2 a wrapper or covering. 3 the structure within a balloon or airship containing the gas. 4 the outer metal or glass housing of a vacuum tube, electric light, etc. 5 Electr. a curve joining the successive peaks of a modulated wave. 6 Bot. any enveloping structure esp. the calyx or corolla (or both). 7 Math. a line or curve tangent to each line or curve of a given family. Etymology: F enveloppe (as ENVELOP)
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1.
noun Date: circa 1714 a flat usually paper container (as for a letter), something that envelops ; wrapper , 3. the outer covering of an aerostat, the bag containing the gas in a balloon or airship, 4. a natural enclosing covering (as a membrane, shell, or integument), a lipoprotein unit membrane that forms the outer layer of some virions, 5. a curve tangent to each of a family of curves, a surface tangent to each of a family of surfaces, a set of performance limits (as of an aircraft) that may not be safely exceeded, a conventionally accepted limit , Usage: The ˈenand ˈänpronunciations are used with about equal frequency, and both are fully acceptable, though the ˈänversion is sometimes decried as “pseudo-French.” Actually ˈänis exactly what one would expect to hear when a French word like entrepreneur is becoming anglicized. Envelope, however, has been in English for nearly 300 years, plenty of time for it to become completely anglicized and for both of its pronunciations to win respectability. ...Толковый словарь английского языка
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