The layer of skin or tissue located above and adjacent to the fingernail or toenail, particularly the fold of tissue covering the base of the nail.
From epi- (Greek 'upon') + onychium (Latin noun form of Greek onyx 'nail'). A specialized anatomical term for the skin structure above the nail matrix.
That little flap of skin at the base of your fingernail has its own anatomical name—the epionychium! Scientists love giving names to tiny body parts you've probably never thought about, which is why anatomy textbooks are so thick.
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