The enlargement or swelling on roots of nitrogen-fixing plants. The nodules contain symbiotic nitrogen-fixing bacteria.
A nodule is a palpablelesion of the skin measuring up to 1.0 cm in diameter (or along the long axis). A nodule may be benign or malignant depending on what is in the nodule.
Glossary
Definition:
The enlargement or swelling on roots of nitrogen- fixing plants. The nodules contain symbiotic nitrogen- fixing bacteria. See Nitrogen fixation