What does lobe mean?
A lobe is a rounded, projecting, or clearly defined part of something larger. The word is especially common in anatomy, where it names regions or subdivisions of organs such as the brain, lungs, and liver. It can also refer to the fleshy lower part of the ear, a rounded division of a leaf or flower, or a major subdivision of a geological formation. In ordinary use, “lobe” suggests a shape that is rounded, distinct, and somewhat separate from its surroundings. This makes it useful when describing both the form of natural structures and the organization of complex bodies. Although the word is most often a noun, related forms such as “lobed” and “lobate” describe something having lobes, while “lobule” refers more specifically to a small lobe or rounded subdivision.
nounA rounded or projecting part of a larger structure, especially a part of an organ, a leaf, or a geological formation. In anatomy, it may refer to a clearly defined region, such as a lobe of the brain or an ear lobe.
- A rounded or projecting part of a larger structure.
- A distinct anatomical region, especially of the brain, liver, lungs, or other organ.
- The fleshy lower part of the external ear.
- A rounded division or projection of a leaf, flower, or other natural form.
- A major rounded subdivision of a geological formation.
"The doctor explained that the scan showed a small lesion in the lower lobe of the lung."
"The patient’s symptoms were traced to damage in the right frontal lobe of the brain."
"Each leaf on the plant has deeply cut lobes along its edges."
Used for multiple rounded projections, anatomical regions, or subdivisions of a larger structure.
"The organ has several distinct lobes separated by narrow bands of tissue."
From the Greek word for a lobe or projection, “lobe” describes the rounded parts that give organs, leaves, and even clouds their distinctive shapes.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does lobe come from?
The word “lobe” comes through Latin from Greek lobos, meaning a lobe or projection, a term associated with the rounded divisions of leaves and similar forms. English adopted it in anatomical and botanical contexts, where it became established for distinct regions of organs and for projections or divisions of natural structures. The root also appears in related English forms such as “lobate,” “lobation,” and “lobule.”
Related word forms
How lobe is actually used
In medicine and biology, “lobe” is a standard term for a defined part or region of an organ. In general descriptions of leaves and landscapes, it is more descriptive and may suggest a rounded or projecting division.
Easily confused with lobe
A lobe is a distinct projecting or subdivided part of a larger structure, whereas a globe is a complete spherical or rounded object.
A lobe is a part or projection of something larger, while a lobster is a crustacean.