?env?l?up 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. [F enveloppe (as ENVELOP)]
Last updated: 9/3/2011 12:48:30
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