nodule

noun

nod·​ule ˈnä-(ˌ)jül 

: a small mass of rounded or irregular shape: such as

a

: a small rounded lump of a mineral or mineral aggregate

b

: a swelling on a leguminous root that contains symbiotic bacteria

c

: a small abnormal knobby bodily protuberance (such as a tumorous growth or a calcification near an arthritic joint)

Synonyms of nodule

• swelling
• lump
• node
• bump
• bruise
• tumor

Examples of nodule in a Sentence

The examination revealed a nodule on his lung.

a nodule on the leaf indicated that a worm had laid eggs there

Recent Examples on the Web

Of particular interest are polymetallic nodules – agglomerations, typically smaller than a potato, containing manganese and other metals and found in the silt of the deep ocean floor. —Coalter G Lathrop, The Conversation, 13 Mar. 2026

On the seafloor, the nodules are vital habitat, part of a fragile ecosystem of marine species that are adapted to the dark, cold environment. —Lauren Sommer, NPR, 13 Mar. 2026

The fusion crust nodules became more defined at 250x magnification. —Heather Barker, Space.com, 11 Mar. 2026

The main specific risk is the potential for nodules or granulomas (small bumps) forming under the skin, especially if improperly placed or massaged. —Cindy Krischer Goodman, Sun Sentinel, 5 Mar. 2026

Word History

Etymology

Middle English, from Latin nodulus, diminutive of nodus

First Known Use

15th century, in the meaning defined above

Rhymes for nodule

• module

Kids Definition

nodule

noun

nod·​ule ˈnäj-(ˌ)ü(ə)l 

1

: a small rounded mass

manganese nodules on the ocean floor

2

: a swelling on the root of a plant of the legume family that contains nitrogen-fixing bacteria

nodular

ˈnäj-ə-lər

adjective

Medical Definition

nodule

noun

nod·​ule ˈnäj-(ˌ)ü(ə)l 

: a small mass of rounded or irregular shape: as

a

: a small abnormal knobby bodily protuberance (as a tumorous growth or a calcification near an arthritic joint)

b

: the nodulus of the cerebellum