[v. en-vel-uh
p; n. en-vel-uhp, en-vuh-luhp, ahn-] 
verb, -oped, -op⋅ing. noun | 1. | to wrap up in or as in a covering: The long cloak she was wearing enveloped her completely. |
| 2. | to serve as a wrapping or covering for, as a membrane of an organ or a sheath. |
| 3. | to surround entirely. |
| 4. | Military. to attack (an enemy's flank). |
| 5. | envelope. |
[en-vuh-lohp, ahn-] | 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. | Biology. a surrounding or enclosing structure, as a corolla or an outer membrane. |
| 4. | Geometry. 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 established limits, as in technological advance or social innovation. |
| en·vel·op (ěn-věl'əp) tr.v. en·vel·oped, en·vel·op·ing, en·vel·ops
[Middle English envolupen, to be involved in, from Old French envoluper, envoloper : en-, in; see en-1 + voloper, to wrap up.] en·vel'op·er n., en·vel'op·ment n. |
envelope en·ve·lope (ěn'və-lōp', ŏn'-)
n.
An enclosing structure or cover, such as a membrane or the outer coat of a virus.