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medulla
This term carries a clinical and anatomical precision, evoking the image of a dense, central pillar or marrow-like core. It is used almost exclusively in medical, biological, or veterinary contexts to describe the structural center of a complex organ.
While it refers to different locations depending on the organ (such as the kidney or the brain), the consistent theme is the interiority and the critical, often regulatory, function of that central zone. It lacks any casual or metaphorical usage in standard English.
Countable when referring to the specific anatomical structures in different organs, such as the medulla of the kidney versus the medulla of the adrenal gland.
Meanings
Examples
We identified the medulla under a microscope.
The adrenal medulla secretes epinephrine during stress.