The part of a plant, usually underground, that absorbs water and anchors it

• A root vegetable

The part of a tooth embedded in the jawbone

The part of a hair under the skin that holds it

• Hair near the scalp showing natural color after dyeing

The source or fundamental cause; the basis of something

A number that, when raised to a given power, yields another number

• A solution where a function or equation equals zero
• A square root when the power is understood

In UNIX-like systems, the superuser with full privileges

• The highest directory in a filesystem
• The top node of a tree data structure with no parent

The core lexical unit of a word that carries main meaning

• A base word from which other words are derived

The fundamental tone on which a chord is built

The base or attachment point of a structure, as in a wing root

• The bottom of a screw thread groove

To grow roots or take root

• To cause cuttings to form roots

To fix firmly; to establish deeply

To obtain superuser access on a device by bypassing protections