What does loculus mean?
A loculus is a small cavity, chamber, or compartment. In anatomical and palaeontological descriptions, it may denote a tiny space within a bone, shell, plant, or fossil, often one that contains or once contained a distinct structure. In archaeology, a loculus can also refer to a small chamber in a catacomb, including a chamber used for burial. The word is chiefly formal and technical, appearing in scholarly descriptions rather than everyday conversation. It derives from Latin loculus, a diminutive of locus, meaning “place,” so its basic sense is that of a smaller defined space. Although uncommon, the term is useful when precision matters because it distinguishes a small internal cavity or compartment from a cavity or chamber in general.
A small cavity or compartment, especially within a bone or another anatomical structure.
"Each vertebral section contains several small loculi separated by bony partitions."
Chiefly used in technical anatomical, palaeontological, and biological descriptions.
A small chamber, especially a burial chamber in a catacomb.
"The archaeologists entered the loculus through a narrow opening in the wall."
This sense occurs chiefly in archaeological writing about ancient catacombs and rock-cut tombs.
The standard plural is loculi, with the final i pronounced as a separate syllable in careful scholarly usage.
"The specimen's shell is divided into numerous loculi."
From the same Latin root as “local” and “locus,” a loculus is literally a small place: a diminutive cavity or chamber.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does loculus come from?
The English word comes from Latin loculus, a diminutive of locus, meaning “place.” The diminutive ending -culus expresses smallness, giving the word the sense of a small place, cavity, or chamber. Latin loculus was used for small compartments and receptacles, and English later adopted it in specialized anatomical and archaeological senses.
How loculus is actually used
This is a formal and highly specialized term. It is used chiefly in anatomy, palaeontology, archaeology, and related descriptive writing rather than in everyday speech.
Easily confused with loculus
A loculus is a small cavity or compartment, whereas a locus is a place, position, or precisely defined point.