surfer's knot

noun
surf·​er's knot | \ ˈsər-fərz- How to pronounce surfer's knot (audio) \

Medical Definition of surfer's knot

: a knobby lump just below a surfer's knee or on the upper surface of the foot caused by friction and pressure between surfboard and skin

called also surfer's knob, surfer's lump, surfer's nodule

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