protoconulen.
/ˌprəʊtə(ʊ)ˈkəʊnjuːl/, U.S. /ˌproʊdoʊˈkoʊnˌjul/ Zoology.
A minor cusp between the protocone and the paracone of a mammalian upper molar tooth.
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the world > animals > mammals > [noun] > parts of > (parts of) teeth
heel1833
metacone1888
metaconid1888
metaconule1888
paracone1888
paraconid1888
protocone1888
protoconid1888
protoconule1888
mesostyle1892
talonid1897
1888 H. F. Osborn in Amer. Naturalist 22 972 (table) Terms proposed... Protoconule... Terms now in use... Anterior-intermediate cusp.
1905 Amer. Geologist 35 244 The intermediate cusps (protoconule and metaconule) are both well-defined.
1933 A. S. Romer Vertebr. Paleontol. xii. 248 Between protocone and paracone there is often a smaller cusp, the protoconule.
1968 R. Zangerl tr. B. Peyer Compar. Odontol. 187 Intermediate cusps occurred along the trigon, a protoconule between protocone and paracone and a metaconule between protocone and metacone.
1996 Jrnl. Mammalogy 77 75/1 In Hylopetes, protoconules are absent, but there is usually a narrow isthmus on the protoloph close to the protocone.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1888