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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.
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A root vegetable.
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The part of a tooth extending into the bone holding the tooth in place.
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The part of a hair under the skin that holds the hair in place.
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The part of a hair near the skin that has not been dyed, permed, or otherwise treated.
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(figurative) The primary source; origin.
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(aviation) The section of a wing immediately adjacent to the fuselage.
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(engineering) The bottom of the thread of a threaded object.
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(arithmetic) Of a number or expression, a number which, when raised to a specified power, yields the specified number or expression.
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(arithmetic) A square root (understood if no power is specified; in which case, "the root of" is often abbreviated to "root").
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(mathematical analysis) A zero (of an equation).
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(graph theory, computing) The single node of a tree that has no parent.
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(linguistic morphology) 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.
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(linguistics) A word from which another word or words are derived.
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(music) The fundamental tone of any chord; the tone from whose harmonics, or overtones, a chord is composed.
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The lowest place, position, or part.
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(computing) 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.
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(computing) The highest directory of a directory structure which may contain both files and subdirectories.
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(slang) A penis, especially the base of a penis.