nodule

Everyday

A small round lump, especially on the body, a plant root or in a rock. tree →

In the lessons

In science lessons, root nodules on peas, beans and clover hold bacteria that take nitrogen from the air and feed the plant. In medicine, a nodule is a small lump that a doctor checks. In geology, flint and other minerals form nodules in rocks like chalk.

Examples

• Clover has little nodules on its roots. tree →
• The bacteria in the nodules help the plant get nitrogen. tree →
• We found flint nodules in the chalk cliff. tree →
• The doctor checked a small nodule on Grandad's neck. tree →
• Nodules on bean roots look like tiny pink beads. tree →
• Most nodules are harmless, but a doctor should look at any new lump. tree →

Note

Countable. It means a small node or lump. Related: node. Safety: if you find a new lump on your body, tell a parent, who may ask a doctor; most are harmless.