triradius
noun
tri·ra·di·us
-ˈrād-ē-əs 
plural triradii
-ē-ˌī
also triradiuses
also triradiuses
: a group of ridges forming a Y at the base of each finger on the palm of the hand
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“Triradius.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/triradius. Accessed 16 Apr. 2024.
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