[ trahy-rey-dee-uhs ]
/ traɪˈreɪ di əs /
noun, plural tri·ra·di·i [trahy-rey-dee-ahy], /traɪˈreɪ diˌaɪ/, tri·ra·di·us·es.Physical Anthropology.
a Y-shaped group of ridges on the palm of the hand at the base of each finger.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020