wrapper

ot noun

1. One who, or that which, wraps. He proved to be a remarkably efficient wrapper of parcels.
2. A construct, such as a class or module, that serves to mediate access to another. We need a Perl wrapper for this C++ library.
3. Something that is wrapped around something else as a cover or protection: a wrapping.
4. An outer garment; a loose robe or dressing gown.