| 单词 | envelope |
| 释义 | 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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