root /ɹuːt/noun 22verb 12forms 5phrases 5 noun22 •the part of a plant that is under the ground, holds it in place and takes in water and foodThis tree's roots can go as deep as twenty metres underground. •(figurative) The primary source; origin.The love of money is the root of all evil. •The part of a tooth extending into the bone holding the tooth in place.Root damage is a common problem of overbrushing. •The part of a hair under the skin that holds the hair in place.The root is the only part of the hair that is alive. •The section of a wing immediately adjacent to the fuselage. •The part of a hair near the skin that has not been dyed, permed, or otherwise treated.He dyed his hair black last month, so the grey roots can be seen. •Of a number or expression, a number which, when raised to a specified power, yields the specified number or expression.The cube root of 27 is 3. •A square root (understood if no power is specified; in which case, “the root of” is often abbreviated to “root”).Multiply by root 2. •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.In so moche that if any verbe be of the thyꝛde coniugation / I set out all his rotes and tenses[…] — 1530 •A word from which another word or words are derived. •The single node of a tree that has no parent. •The highest directory of a directory structure which may contain both files and subdirectories.I installed the files in the root directory. •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.I have to log in as root before I do that. •A root vegetable.[...] two fields which should have been sown with roots in the early summer were not sown because the ploughing had not been completed early enough. — 1943 •(slang, vulgar) An act of sexual intercourse.Fancy a root? •An act of rummaging or searching.It was always sensible to get off the busy streets if you were going to have a root inside your girlfriend's bra. — 2002 •The bottom of the thread of a threaded object.The root diameter is the minor diameter of an external thread and the major diameter of an internal one. •The lowest place, position, or part. •The fundamental tone of any chord; the tone from whose harmonics, or overtones, a chord is composed. •A zero (of an equation). •(slang) A penis, especially the base of a penis. •(slang, vulgar) A sexual partner. verb12 •To cheer (on); to show support (for) and hope for the success of. (See root for.)I'm rooting for you, don't let me down! •To grow roots; to enter the earth, as roots; to take root and begin to grow.The cuttings are starting to root. •To prepare, oversee, or otherwise cause the rooting of cuttings.We rooted some cuttings last summer. •To fix firmly; to establish.If any irregularity chanced to intervene and to cause misapprehensions, he gave them not leave to root and fasten by concealment. — 1823 •To turn up or dig with the snout.A pig roots the earth for truffles. •To rummage; to search as if by digging in soil.rooting about in a junk-filled drawer •To get root or privileged access on (a computer system or mobile phone), often through bypassing some security mechanism.We rooted his box and planted a virus on it.I want to root my Android phone so I can remove the preinstalled crapware. •To root out; to abolish.I will go root away the noisome weeds. — 1595 •Of a baby: to turn the head and open the mouth in search of food. •(slang, vulgar) To sexually penetrate. •To seek favour or advancement by low arts or grovelling servility; to fawn.Thou elvish-marked, abortive, rooting hog! — 1593 •To tug or pull at the reins aggressively by driving the head downwards while wearing a bit. formsrooted · rooting · rooteth · roots · rootest Phrases with root root aboutTo forage by poking the snout here and there. root causeAn initiating cause of a chain of events which leads to an outcome or effect of interest. root forTo support (a favored person, team, or result). root outTo remove or abolish completely. root upTo dig or pull up by the roots.