} techspeak, widely propagated via UNIX] n.
1. [techspeak] The command interpreter used to pass commands to an
operating system; so called because it is the part of the operating
system that interfaces with the outside world. 2. More generally,
any interface program that mediates access to a special resource
for convenience, efficiency, or security reasons; for
this meaning, the usage is usually `a shell around' whatever.
This sort of program is also called a `wrapper'.