What does nodule mean?
A nodule is a small, rounded lump or mass. The word is especially useful in medicine, where it describes a small mass of tissue, such as a thyroid nodule or a lump beneath the skin, and in geology, where it describes a compact mass of mineral within a larger rock. In general use, “nodule” is more specific and technical than “lump”: it suggests a distinct, compact body rather than an indefinite swelling or irregular mass. The word can also apply to small rounded projections or grains in other technical settings. Its Latin origin connects it to “node” and “nodus,” both meaning a knot, which nicely captures the idea of a small, organized knot-like form.
nounA nodule is a small, usually rounded lump or mass. In medicine and geology, the term refers respectively to a small abnormal mass of tissue and to a compact mass of mineral within a larger rock.
- A small, rounded lump or mass, especially of tissue.
- A small abnormal growth or swelling in an organ, such as the thyroid.
- A compact mass of mineral or other material within a larger rock.
"The scan revealed a small nodule in her thyroid, which the doctor said would be monitored."
"The patient had a painless nodule beneath the skin."
"The ore contained small nodules of pyrite scattered through the host rock."
The standard plural is nodules.
"Several small nodules were identified along the edge of the scan."
From a tiny lump under the skin to a bead of mineral locked in rock, a nodule is a miniature knot.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does nodule come from?
Nodule comes from the Latin diminutive nodulus, meaning “small knot,” which is derived from nodus, “knot” or “node.” It entered English through scientific and medical usage, where it was applied to small bodily lumps and, later, to rounded mineral masses in rocks. The root is also reflected in English words such as node, nodus, and nodosity.
Related word forms
How nodule is actually used
The term is most common in medical and geological contexts. In medicine, it usually refers to a distinct, usually small mass that may be benign or otherwise require assessment; in geology, it refers to a rounded mineral mass.
Easily confused with nodule
A node is generally a larger structural junction or swelling, while a nodule is specifically a small rounded lump.