![]() 1877, James Booth, A Treatise on Some New Geometrical Methods (page 209) Again, if the plane of the impressed couple intersects the mean plane between N and C, it will envelope the cone whose focals are ON, ON′, and whose internal axis is therefore OA.įrom French enveloppe, from envelopper.Wikipedia article on envelopes in geometryĮnvelope ( third-person singular simple present envelopes, present participle enveloping, simple past and past participle enveloped).Wikipedia article on envelopes used for mailing. ![]() ( bag containing the lifting gas): gasbag.(Can we find and add a quotation of Wilhelm to this entry?) Envelope Part of speech: noun Definition: A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing. while Superscribe as a verb is to write on the exterior of, the surface of, or above. An earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it. Envelope as a noun is a paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.( astronomy ) The nebulous covering of the head or nucleus of a comet a coma.( engineering ) The set of limitations within which a technological system can perform safely and effectively.( biology ) An enclosing structure or cover, such as a membrane a space between two membranes.( computing ) The information used for routing a message that is transmitted with the message but not part of its contents.( music ) The shape of a sound, which may be controlled by a synthesizer or sampler.( electronics ) A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.( geometry ) A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.A bag containing the lifting gas of a balloon or airship fabric that encloses the gas-bags of an airship.A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
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