undergroundroot
nounUK /ˌʌndəˈɡraʊnd ruːt/
US /ˌʌndərˈɡraʊnd ruːt/
A root is a plant part that grows under the ground and drinks up water.
The undergroundroot of the carrot was long and orange.
OTHER MEANINGS
2. A secret or hidden base of support for an idea or group.
The movement had an undergroundroot in small village meetings.
3. A part of something that is not visible but holds it up.
Trust is the undergroundroot of a good friendship.
4. A plant part that stores food below the soil.
The undergroundroot of the potato stores energy for the plant.