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triradius

[trahy-rey-dee-uh s]
noun, plural tri·ra·di·i [trahy-rey-dee-ahy] /traɪˈreɪ diˌaɪ/, tri·ra·di·us·es. Physical Anthropology.
  1. a Y-shaped group of ridges on the palm of the hand at the base of each finger.
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Origin of triradius

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018