noun
root nodule
Botanical term for the small swellings on the roots of legumes and other plants, formed by nitrogen-fixing bacteria.
マメ科植物の根には根粒ができる。
Root nodules form on the roots of leguminous plants.
Compound of 根 (root) and 粒 (grain, nodule). The alternate form 根瘤 uses 瘤 (swelling, tumor) to emphasize the swollen appearance.