| 单词 | envelope |
| 释义 | envelope /en"veuh lohp', ahn"-/, n. 1. a flat paper container, as for a letter or thin package, usually having a gummed flap or other means of closure. 2. something that envelops; a wrapper, integument, or surrounding cover. 3. Biol. a surrounding or enclosing structure, as a corolla or an outer membrane. 4. Geom. a curve or surface tangent to each member of a set of curves or surfaces. 5. Radio. (of a modulated carrier wave) a curve connecting the peaks of a graph of the instantaneous value of the electric or magnetic component of the carrier wave as a function of time. 6. the fabric structure enclosing the gasbag of an aerostat. 7. the gasbag itself. 8. Electronics. the airtight glass or metal housing of a vacuum tube. 9. the technical limits within which an aircraft or electronic system may be safely operated. 10. push the envelope, to stretch the limits, as of technological advance, social innovation, etc. Also, envelop. [1700-10; < F enveloppe, deriv. of envelopper to ENVELOP] |
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