envelope

Al Fayed had form for using envelopes of cash as a tool of power and control.

"This practice removes the lipid envelope of the virus and inactivates it," they note.

A hush fell over the boisterous crowd - including dozens of journalists - as officials drew tickets from a manila envelope.

If you see “final notice,” “urgent” or “benefit disbursement enclosed,” don’t even bother opening the envelope.

Astronomers refer to this as the common envelope phase, as both stars become wrapped in the same material.