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(biology) Describing the original placental molars that have a talonid in the lower molar teeth, where the protocone of the upper teeth hits. Definied by George Gaylord Simpson in 1936.
^ Simpson, George Gaylord, « Studies of the Earliest Mammalian Dentitions*. (Continued) », The Dental cosmos; a monthly record of dental science, vol. 78, no 2, 1936, p. 791-800
Tribosphenic molar on Wikipedia.Wikipedia 