microkernel 
noun Computing
A small modular part of an operating system kernel which implements its basic features.A superior approach is to instead implement a microkernel, or lightweight operating system, designed for the specific purpose of serving data....
- Their argument was that, due to their intrinsic design, microkernels' basic functions could be transformed into modules and, thus, loaded and unloaded as needed.
- According to long-running Mac user website MacInTouch, at least one CD distributed by the major label includes a Mac OS X application that purportedly installs a pair of extensions to the operating system's microkernel.
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- plug
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- pluggable