nodule

A small knotlike protuberance.

A small, abnormal but usually benign mass of tissue, as on the thyroid gland, in the lung, or under the skin.

A small knoblike outgrowth, especially one on the roots of a leguminous plant that contains bacteria that fix nitrogen.

A small rounded lump of a mineral or mixture of minerals, usually harder than the surrounding rock or sediment.

A little knot or lump.

The peculiar knot upon the roots of leguminous and a few other plants, caused by bacteria. (See nodule-bacteria, under bacterium.) They enable the plant to use atmospheric nitrogen. See root-tubercle.

A rounded mass or irregular shape; a little knot or lump.

A rounded mass or irregular shape; a little knot or lump.

a small node

small rounded wartlike protuberance on a plant