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triradius

[ trahy-rey-dee-uhs ]

noun

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


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Word History and Origins

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Example Sentences

The normal angle is around 48�; the higher the axial triradius, the larger the angle�around 80� in mongolism, and still greater in some of the other chromosomal abnormalities.

British researchers measure the angle between the axial triradius and those at the base of the index and little fingers.

Then there are five places where the normal palm shows what researchers call a triradius�a wide-open letter Y formed by the junction of three lines.

The crucial one is the axial triradius; on most palms it is just above the first flesh crease where hand joins wrist.

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triradiateTriratna