ptychodontadj.n.

Brit.

/ˈtʌɪkədɒnt/,

/ˈtɪkəʊdɒnt/, U.S.

/ˈtaɪkəˌdɑnt/,

/ˈtɪkoʊˌdɑnt/

Origin: A borrowing from Greek, combined with an English element; partly modelled on a Latin lexical item. Etymons: Greek πτυχή , -odont comb. form.

Etymology: < ancient Greek πτυχή fold (see ptychode n.) + -odont comb. form. In later specific sense of the noun, after scientific Latin Ptychodontidae, family name (attributed to Jaekel, 1898; after Ptychodus, genus name ( L. Agassiz Poissons fossiles III. (1839) xiv. 56)).

Chiefly Palaeontology.

A. adj.

Of a tooth: having a series of ridges that acts as a grinding surface; (originally spec. of a mammalian molar) having the crown folded at the sides, with the folds often crossing the crown. Of a dentition: consisting of such teeth. Now rare.

ΚΠ

1874 Proc. Acad. Nat. Sci. Philadelphia 1873 371 Prof. Cope explained the scope of the paper read by him as follows:..the sides of the crown vertically plicate (Ptychodont).

1897 Amer. Naturalist 31 485 The dentition is lophodont, becoming ptychodont in some of the later forms.

1934 Jrnl. Mammalogy 15 183 A division distinguished by highly folded or ptychodont grinding teeth.

1966 Bull. Brit. Mus. Nat. Hist.: Geol. 11 vii.340 Forms with a ptychodont dentition..must have evolved from hybodontoids in which the dentition was homodont.

B. n.

An animal with ptychodont or similar teeth; spec. a fossil shark of the Cretaceous family Ptychodontidae, with teeth that have a series of parallel folds adapted for crushing shells.

ΚΠ

1895 I. K. Funk et al. Standard Dict. Eng. Lang. II. at Ptycho- Ptychodont, a. & n.

1954 Jrnl. Paleontol. 28 512/2 Elements of the fauna include..Toxochelid and Protostegid turtles, a Ptychodont and several sharks.

1977 Paleobiology 3 250/1 Kauffman..believes ptychodonts to have been important predators on inoceramid bivalves.

1993 Jrnl. Paleontol. 67 466/2 The ptychodonts and Cretoxyrhina mantelli are found as rare elements within the basal marine strata.

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

单词	ptychodont
释义	ptychodontadj.n. Brit. /ˈtʌɪkədɒnt/, /ˈtɪkəʊdɒnt/, U.S. /ˈtaɪkəˌdɑnt/, /ˈtɪkoʊˌdɑnt/ Origin: A borrowing from Greek, combined with an English element; partly modelled on a Latin lexical item. Etymons: Greek πτυχή , -odont comb. form. Etymology: < ancient Greek πτυχή fold (see ptychode n.) + -odont comb. form. In later specific sense of the noun, after scientific Latin Ptychodontidae, family name (attributed to Jaekel, 1898; after Ptychodus, genus name ( L. Agassiz Poissons fossiles III. (1839) xiv. 56)). Chiefly Palaeontology. A. adj. Of a tooth: having a series of ridges that acts as a grinding surface; (originally spec. of a mammalian molar) having the crown folded at the sides, with the folds often crossing the crown. Of a dentition: consisting of such teeth. Now rare. ΚΠ 1874 Proc. Acad. Nat. Sci. Philadelphia 1873 371 Prof. Cope explained the scope of the paper read by him as follows:..the sides of the crown vertically plicate (Ptychodont). 1897 Amer. Naturalist 31 485 The dentition is lophodont, becoming ptychodont in some of the later forms. 1934 Jrnl. Mammalogy 15 183 A division distinguished by highly folded or ptychodont grinding teeth. 1966 Bull. Brit. Mus. Nat. Hist.: Geol. 11 vii.340 Forms with a ptychodont dentition..must have evolved from hybodontoids in which the dentition was homodont. B. n. An animal with ptychodont or similar teeth; spec. a fossil shark of the Cretaceous family Ptychodontidae, with teeth that have a series of parallel folds adapted for crushing shells. ΚΠ 1895 I. K. Funk et al. Standard Dict. Eng. Lang. II. at Ptycho- Ptychodont, a. & n. 1954 Jrnl. Paleontol. 28 512/2 Elements of the fauna include..Toxochelid and Protostegid turtles, a Ptychodont and several sharks. 1977 Paleobiology 3 250/1 Kauffman..believes ptychodonts to have been important predators on inoceramid bivalves. 1993 Jrnl. Paleontol. 67 466/2 The ptychodonts and Cretoxyrhina mantelli are found as rare elements within the basal marine strata. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < adj.n.1874
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