Wrapper

noun

1. Something that is wrapped around something else as a cover or protection: a wrapping.
2. An outer garment; a loose robe or dressing gown.
3. One who, or that which, wraps.

   "He proved to be a remarkably efficient wrapper of parcels."

4. A construct, such as a class or module, that serves to mediate access to another.

   "We need a Perl wrapper for this C++ library."