pachyodontadj.n.

Brit.

/ˈpakɪə(ʊ)ˌdɒnt/, U.S.

/ˈpækioʊˌdɑnt/

Origin: Formed within English, by compounding. Etymons: pachy- comb. form, -odont comb. form.

Etymology: < pachy- comb. form + -odont comb. form.R. G. Mayne Expos. Lex. (1857) gives a Latin form pachyodon and a French form pachyodonte (both adjectives).

Zoology and Palaeontology.

A. adj.

Having thick or massive teeth; spec. of, relating to, or designating (the dentition of) a bivalve mollusc characterized by one to three heavy, blunt teeth in the hinge of the shell, as typical of the extinct rudists (sometimes classified in an order Pachyodonta). Cf. pachydont adj.

ΚΠ

1890 Cent. Dict. Pachyodont, having thick or massive teeth, as a mammal or a mollusk.

1920 Jrnl. Geol. Soc. Tokyo 27 39 The so-called Trigonia-sandstone of Miyako..contains a Pachyodont Lamellibranch.

1952 R. C. Moore et al. Invertebr. Fossils x. 441 (caption) Representative pachyodont pelecypods.

1979 Revue Roumaine de Geol., Geophysique et Geogr.: Geol. 23 117 (title) The presence of some pachyodont fossils in the garnetiferous-diopsidic-epidote skarn of the pyrometasomatic deposit at Ocna de Fier, Romania.

B. n.

A pachyodont bivalve mollusc. rare.

ΚΠ

1927 R. L. Lupher (title of Master's thesis, Univ. of Oregon) Two new genera of pachyodonts from the Mesozoic of Oregon.

1952 R. C. Moore et al. Invertebr. Fossils x. 440/2 A majority of the pachyodonts are characterized by having a much larger right valve than left.

1959 Science 1 May 1217/3 The 20 pages devoted to the pachyodonts form probably the best available modern summary on these complex bivalves.

This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022).

单词	pachyodont
释义	pachyodontadj.n. Brit. /ˈpakɪə(ʊ)ˌdɒnt/, U.S. /ˈpækioʊˌdɑnt/ Origin: Formed within English, by compounding. Etymons: pachy- comb. form, -odont comb. form. Etymology: < pachy- comb. form + -odont comb. form.R. G. Mayne Expos. Lex. (1857) gives a Latin form pachyodon and a French form pachyodonte (both adjectives). Zoology and Palaeontology. A. adj. Having thick or massive teeth; spec. of, relating to, or designating (the dentition of) a bivalve mollusc characterized by one to three heavy, blunt teeth in the hinge of the shell, as typical of the extinct rudists (sometimes classified in an order Pachyodonta). Cf. pachydont adj. ΚΠ 1890 Cent. Dict. Pachyodont, having thick or massive teeth, as a mammal or a mollusk. 1920 Jrnl. Geol. Soc. Tokyo 27 39 The so-called Trigonia-sandstone of Miyako..contains a Pachyodont Lamellibranch. 1952 R. C. Moore et al. Invertebr. Fossils x. 441 (caption) Representative pachyodont pelecypods. 1979 Revue Roumaine de Geol., Geophysique et Geogr.: Geol. 23 117 (title) The presence of some pachyodont fossils in the garnetiferous-diopsidic-epidote skarn of the pyrometasomatic deposit at Ocna de Fier, Romania. B. n. A pachyodont bivalve mollusc. rare. ΚΠ 1927 R. L. Lupher (title of Master's thesis, Univ. of Oregon) Two new genera of pachyodonts from the Mesozoic of Oregon. 1952 R. C. Moore et al. Invertebr. Fossils x. 440/2 A majority of the pachyodonts are characterized by having a much larger right valve than left. 1959 Science 1 May 1217/3 The 20 pages devoted to the pachyodonts form probably the best available modern summary on these complex bivalves. This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022). < adj.n.1890
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