The part of a plant, generally underground, that anchors and supports the plant body, absorbs and stores water and nutrients, and in some plants is able to perform vegetative reproduction. • A root vegetable. • The part of a tooth extending into the bone holding the tooth in place. • The part of a hair under the skin that holds the hair in place. • The part of a hair near the skin that has not been dyed, permed, or otherwise treated. • The primary source; origin. • The section of a wing immediately adjacent to the fuselage. • The bottom of the thread of a threaded object. • Of a number or expression, a number which, when raised to a specified power, yields the specified number or expression. • A square root (understood if no power is specified; in which case, “the root of” is often abbreviated to “root”). • A zero (of an equation). • The single node of a tree that has no parent. • The primary lexical unit of a word, which carries the most significant aspects of semantic content and cannot be reduced into smaller constituents. Inflectional stems often derive from roots. • A word from which another word or words are derived. • The fundamental tone of any chord; the tone from whose harmonics, or overtones, a chord is composed. • The lowest place, position, or part. • In UNIX terminology, the first user account with complete access to the operating system and its configuration, found at the root of the directory structure; the person who manages accounts on a UNIX system. • The highest directory of a directory structure which may contain both files and subdirectories. • A penis, especially the base of a penis.