triradius

noun
tri·​ra·​di·​us | \ -ˈrād-ē-əs How to pronounce triradius (audio) \
plural triradii\ -​ē-​ˌī How to pronounce triradii (audio) \ also triradiuses

Medical Definition of triradius

: a group of ridges forming a Y at the base of each finger on the palm of the hand

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