Root

Root is the name of the administrator account in Unix systems.

the part of a tooth that is embedded in the jaw and serves as support

(linguistics) the form of a word after all affixes are removed

a simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes

the set of values that give a true statement when substituted into an equation

the place where something begins, where it springs into being

someone from whom you are descended (but usually more remote than a grandparent)

(botany) the usually underground organ that lacks buds or leaves or nodes

a number that, when multiplied by itself some number of times, equals a given number