Medical Definition of papilla
: a small projecting body part similar to a nipple in form: asa: a vascular process of connective tissue extending into and nourishing the root of a hair, feather, or developing toothb: any of the vascular protuberances of the dermal layer of the skin extending into the epidermal layer and often containing tactile corpusclesc: renal papillad: any of the small protuberances on the upper surface of the tongue—see circumvallate papilla, filiform papilla, fungiform papilla, interdental papilla, optic papilla
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