root

1. 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. (countable, uncountable) · This tree's roots can go as deep as twenty metres underground.
2. A root vegetable. (countable, uncountable)
3. The part of a tooth extending into the bone holding the tooth in place. (countable, uncountable) · Root damage is a common problem of overbrushing.
4. The part of a hair under the skin that holds the hair in place. (countable, uncountable) · The root is the only part of the hair that is alive.
5. The part of a hair near the skin that has not been dyed, permed, or otherwise treated. (countable, uncountable) · He dyed his hair black last month, so the grey roots can be seen.
6. The primary source; origin. (countable, figuratively, uncountable) · The love of money is the root of all kinds of evil.
7. The section of a wing immediately adjacent to the fuselage. (countable, uncountable)
8. The bottom of the thread of a threaded object. (countable, uncountable) · The root diameter is the minor diameter of an external thread and the major diameter of an internal one.

Plural roots