What is a root?

Definition
	A root is the portion of a word that
	is common to a set of derived or inflected forms, if any, when all affixes are removed is not further analyzable into meaningful elements, being morphologically simple, and carries the principle portion of meaning of the words in which it functions.

Discussion
	If a root does not occur by itself in a meaningful way in a language, it is referred to as a bound morpheme.

Examples (English)
	Disestablish Establishment Establishments

Generic
	A root is a kind of
	What is a morpheme type?