In a tree, a node with no parents, but which typically has daughters.
- Root nodule
noun 1. a swelling on the root of a leguminous plant, such as the pea or clover, that contains bacteria of the genus Rhizobium, capable of nitrogen fixation
- Root normal form
(RNF) Head Normal Form in graph rewriting.
- Root of lung
root of lung n. All the structures entering or leaving the lung at the hilum.
- Root of penis
root of penis n. The proximal attached part of the penis, including the two crura and the bulb.