WordReference Random House Unabridged Dictionary of American English © 2020
tra•gi•on  (trājē on′),USA pronunciation n., pl.  -gi•a (trājē on′),USA pronunciation  -gi•ons. [Cephalom.]
  1. a point in the depth of the notch just above the tragus of the ear.
  • trag(us) + -ion 1560–70

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