Etymology
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Words related to root

uproot (v.)
1590s (implied in uprooted), in the figurative sense, from up (adv.) + root (v.). The literal sense is first recorded 1690s. Related: Uprooted; uprooting.
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*wrād- 

Proto-Indo-European root meaning "branch, root."

It forms all or part of: deracinate; eradicate; eradication; irradicable; licorice; radical; radicant; radicle; radicular; radish; ramada; ramify; ramus; rhizoid; rhizome; rhizophagous; root; rutabaga; wort.

It is the hypothetical source of/evidence for its existence is provided by: Greek rhiza, Lesbian brisda "root," Greek hradamnos "branch;" Latin radix) "root, radish;" Gothic waurts, Old English wyrt; Welsh gwraidd, Old Irish fren "root."

wort (n.)

"a plant," Old English wyrt "root, herb, vegetable, plant, spice," from Proto-Germanic *wurtiz (source also of Old Saxon wurt, Old Norse, Danish urt, Old High German wurz "plant, herb," German Wurz, Gothic waurts, Old Norse rot "root"), from PIE root *wrād- "branch, root." St. John's wort attested from 15c.

radical (adj.)

late 14c., "originating in the root or ground;" of body parts or fluids, "vital to life," from Latin radicalis "of or having roots," from Latin radix (genitive radicis) "root" (from PIE root *wrād- "branch, root"). The basic sense of the word in all meanings is "pertaining or relating to a root or roots," hence "thoroughgoing, extreme."

The figurative meaning "going to the origin, essential" is from 1650s. The political sense of "reformist" is by 1817, of the extreme section of the British Liberal party (radical reform had been a current phrase since 1786), via the notion of "change from the roots" (see radical (n.)). The meaning "unconventional" is from 1921. U.S. youth slang use is from 1983, from 1970s surfer slang meaning "at the limits of control."

The mathematical radical sign, placed before any quantity to denote that its root is to be extracted, is from 1680s; the sign itself is a modification of the letter -r-. Radical chic is attested from 1970; popularized, if not coined, by Tom Wolfe. Radical empiricism was coined 1897 by William James (see empiricism).

arrow-root (n.)

also arrowroot, "starch obtained from some species of a West Indian plant," 1690s, from arrow + root (n.). So called because the plant's fresh roots or tubers were used to absorb toxins from poison-dart wounds.

beet-root (n.)
1570s, from beet (n.) + root (n.).
blood-root (n.)
1570s as the name of a European plant with red-colored roots; later transferred to an early-flowering North American herb with the same property, from blood (n.) + root (n.).
grass roots (n.)
1650s, from grass + root (n.). The image of grass roots as the most fundamental level of anything is from 1901; U.S. political sense of "the rank and file of the electorate" (also grassroots) is attested from 1912; as an adjective by 1918.
root-cellar (n.)

"cellar set aside for storage of roots and tubers," 1822, from root (n.) + cellar (n.).

rootless (adj.)

late 14c., roteles, "without roots, having no root," from root (n.) + -less. Figurative use by 1650s. Related: Rootlessly; rootlessness.