What does lamina mean?
A lamina is a thin, flat layer, plate, or sheet. In botany, it specifically means the broad part of a leaf, the structure that spreads outward from the petiole and provides most of the surface area for photosynthesis. In anatomy and biology, the term describes a distinct layer of tissue within a larger organ or structure, such as the lamina propria beneath an epithelial layer. Geologists also use it for a thin, sheet-like division of rock or mineral. Because “lamina” is more specific than “layer,” it is especially useful in technical descriptions where the material’s thinness, structure, or position matters. The standard plural is laminae, a form common in scientific writing. Although the word can sound ornamental in ordinary prose, it is valuable whenever precision is needed to distinguish a particular plate-like component from the whole structure containing it.
nounA thin, flat layer or plate. In botany, it is the broad, usually flat part of a leaf; in anatomy and other technical fields, it refers to a distinct layer or plate within a larger structure.
- A thin, flat layer or plate within a larger structure, especially in anatomy or biology.
- The broad, usually flat part of a leaf, also called the leaf blade.
- A thin, sheet-like layer of mineral or rock.
"Each leaf has a thin lamina that spreads out to capture light."
"The protective lamina forms a thin shield over the young leaf."
"Histologists identified a distinct lamina of connective tissue beneath the surface."
The plural laminae is standard in scientific and technical writing.
"Several thin laminae of tissue were visible under the microscope."
From a Latin word meaning a thin sheet, lamina came to name both a leaf’s flat blade and a delicate layer inside the body.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does lamina come from?
The English word comes from Latin lamina, meaning a thin plate, sheet, or layer. Latin itself developed the word in the sense of a thin piece of material, especially metal, wood, or bone. Related English forms include laminate, lamination, and lamella, all reflecting the shared idea of a flat layer or plate.
How lamina is actually used
The term is chiefly technical in anatomy, biology, botany, and geology. In general writing, it is more precise and formal than simply “layer” or “plate.”
Easily confused with lamina
A lamella is a small, often microscopic thin plate or layer, whereas a lamina is the general term for a plate or layer and commonly refers to the flat part of a leaf.