protoconen.

Brit.

/ˈprəʊtəkəʊn/, U.S.

/ˈproʊdəˌkoʊn/

Origin: Formed within English, by compounding. Etymons: proto- comb. form, cone n.¹

Etymology: < proto- comb. form + cone n.¹; so named because it was thought to represent the apex of the primitive conical reptilian tooth, though later research indicates that this is actually represented by the paracone. Compare protoconid n. Compare also hypocone n., metacone n., and paracone n.

Zoology.

A cusp on the anterior lingual corner of a mammalian upper molar tooth.

ΘΚΠ

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 Jrnl. Acad. Nat. Sci. Philadelphia 9 242 The primitive cone may be called the protocone; upon the anterior and posterior slopes of which appear, respectively, the paracone and metacone.

1896 Proc. Zool. Soc. 573 In the deciduous 4th premolar [of Centetes] likewise the protocone develops first.

1933 A. S. Romer Vertebr. Paleontol. xii. 248 A single cusp is found at the inner apex; this was originally believed to represent the original reptilian cone and hence is called the protocone.

1976 Nature 5 Aug. 464/2 The upper first deciduous molar displays spatial dominance of the protocone.

1990 M. J. Benton Vertebr. Palaeontol. ix. 244 The two new ones [sc. shearing surfaces] have arisen on the vastly expanded medial portion of the upper molar whose highest point, the protocone, fits into a depression on the lower, the talonid basin.

Derivatives

ˌprotoˈconal adj. of or relating to a protocone.

ΚΠ

1932 Jrnl. Mammalogy 13 264 The root does not project forward and P³ overlaps the anterior border of the protoconal region.

1960 Jrnl. Paleontol. 34 984/2 The protoconal ridge rises gradually to the centre of the tooth.

1994 Jrnl. Mammalogy 75 479 The protoconal crest is reduced to a weak bulge on the anterior slope of the protocone.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protocone
释义	protoconen. Brit. /ˈprəʊtəkəʊn/, U.S. /ˈproʊdəˌkoʊn/ Origin: Formed within English, by compounding. Etymons: proto- comb. form, cone n.¹ Etymology: < proto- comb. form + cone n.¹; so named because it was thought to represent the apex of the primitive conical reptilian tooth, though later research indicates that this is actually represented by the paracone. Compare protoconid n. Compare also hypocone n., metacone n., and paracone n. Zoology. A cusp on the anterior lingual corner of a mammalian upper molar tooth. ΘΚΠ 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 Jrnl. Acad. Nat. Sci. Philadelphia 9 242 The primitive cone may be called the protocone; upon the anterior and posterior slopes of which appear, respectively, the paracone and metacone. 1896 Proc. Zool. Soc. 573 In the deciduous 4th premolar [of Centetes] likewise the protocone develops first. 1933 A. S. Romer Vertebr. Paleontol. xii. 248 A single cusp is found at the inner apex; this was originally believed to represent the original reptilian cone and hence is called the protocone. 1976 Nature 5 Aug. 464/2 The upper first deciduous molar displays spatial dominance of the protocone. 1990 M. J. Benton Vertebr. Palaeontol. ix. 244 The two new ones [sc. shearing surfaces] have arisen on the vastly expanded medial portion of the upper molar whose highest point, the protocone, fits into a depression on the lower, the talonid basin. Derivatives ˌprotoˈconal adj. of or relating to a protocone. ΚΠ 1932 Jrnl. Mammalogy 13 264 The root does not project forward and P³ overlaps the anterior border of the protoconal region. 1960 Jrnl. Paleontol. 34 984/2 The protoconal ridge rises gradually to the centre of the tooth. 1994 Jrnl. Mammalogy 75 479 The protoconal crest is reduced to a weak bulge on the anterior slope of the protocone. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1888
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