haplodontadj.n.

Brit.

/ˈhaplə(ʊ)dɒnt/, U.S.

/ˈhæpləˌdɑnt/

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

Etymology: < haplo- comb. form + -odont comb. form. In senses A. 2 and B. after scientific Latin Haplodontidae, former family name (1876 or earlier).The mountain beaver was validly named Aplodontia by J. Richardson in 1829 ( Zool. Jrnl. 4 334), but the name was emended by later writers to Haplodon, Haplodontia, and other forms. The family name has also had many forms, the earliest being Haploodontini (Brandt 1855); the correct modern form is Aplodontiidae (Thomas 1897).

Zoology.

A. adj.

1. Having the crowns of the molar teeth simple or single, and not divided into ridges, etc.

ΚΠ

1874 Proc. Acad. Nat. Sci. Philadelphia 1873 371 The types of molar teeth are considered to be four, viz., the simple conic or truncate (Haplodont); [etc.].

1897 Amer. Naturalist 31 999 Both the ‘haplodont’ and ‘triconodont’ crowns are seen to-day among the Cetacea.

1977 P. Hershkovitz Living New World Monkeys I. ii. xxxii. 294/2 The cheek teeth of earliest known mammals..are not haplodont.

2004 Clin. Techniques Equine Pract. 4 156/2 Haplodont and tuberculate supernumerary teeth may occur due to division of the primordium.

†2. Resembling or characteristic of the rodent family Aplodontiidae (formerly Haplodontidae). See sense B. Obsolete. rare.

ΚΠ

1877 E. Coues & J. A. Allen Monogr. N. Amer. Rodentia (U.S. Geol. Surv. Territories, vol. XI) ix. 554 I am inclined to consider the Haplodont type as probably the oldest among existing Sciuromorphs.

B. n.

A mammal of the rodent family Aplodontiidae (formerly Haplodontidae), which includes the mountain beaver or sewellel, Aplodontia rufa, and its extinct relatives. Now disused.

ΚΠ

1895 Nat. Sci. Nov. 339 I am unable to say whether it [sc. the supinator longus muscle] is found in the families of the Anomalures and Haplodonts.

1910 H. F. Osborn Age of Mammals v. 308 (table) Haplodonts, sewellels.

1921 Amer. Jrnl. Physical Anthropol. 4 185 Miller and Gidley..consider them [sc. the genus Paramys] ancestral to the living Haplodonts.

This entry has been updated (OED Third Edition, December 2013; most recently modified version published online March 2022).

单词	haplodont
释义	haplodontadj.n. Brit. /ˈhaplə(ʊ)dɒnt/, U.S. /ˈhæpləˌdɑnt/ Origin: Formed within English, by compounding. Etymons: haplo- comb. form, -odont comb. form. Etymology: < haplo- comb. form + -odont comb. form. In senses A. 2 and B. after scientific Latin Haplodontidae, former family name (1876 or earlier).The mountain beaver was validly named Aplodontia by J. Richardson in 1829 ( Zool. Jrnl. 4 334), but the name was emended by later writers to Haplodon, Haplodontia, and other forms. The family name has also had many forms, the earliest being Haploodontini (Brandt 1855); the correct modern form is Aplodontiidae (Thomas 1897). Zoology. A. adj. 1. Having the crowns of the molar teeth simple or single, and not divided into ridges, etc. ΚΠ 1874 Proc. Acad. Nat. Sci. Philadelphia 1873 371 The types of molar teeth are considered to be four, viz., the simple conic or truncate (Haplodont); [etc.]. 1897 Amer. Naturalist 31 999 Both the ‘haplodont’ and ‘triconodont’ crowns are seen to-day among the Cetacea. 1977 P. Hershkovitz Living New World Monkeys I. ii. xxxii. 294/2 The cheek teeth of earliest known mammals..are not haplodont. 2004 Clin. Techniques Equine Pract. 4 156/2 Haplodont and tuberculate supernumerary teeth may occur due to division of the primordium. †2. Resembling or characteristic of the rodent family Aplodontiidae (formerly Haplodontidae). See sense B. Obsolete. rare. ΚΠ 1877 E. Coues & J. A. Allen Monogr. N. Amer. Rodentia (U.S. Geol. Surv. Territories, vol. XI) ix. 554 I am inclined to consider the Haplodont type as probably the oldest among existing Sciuromorphs. B. n. A mammal of the rodent family Aplodontiidae (formerly Haplodontidae), which includes the mountain beaver or sewellel, Aplodontia rufa, and its extinct relatives. Now disused. ΚΠ 1895 Nat. Sci. Nov. 339 I am unable to say whether it [sc. the supinator longus muscle] is found in the families of the Anomalures and Haplodonts. 1910 H. F. Osborn Age of Mammals v. 308 (table) Haplodonts, sewellels. 1921 Amer. Jrnl. Physical Anthropol. 4 185 Miller and Gidley..consider them [sc. the genus Paramys] ancestral to the living Haplodonts. This entry has been updated (OED Third Edition, December 2013; most recently modified version published online March 2022). < adj.n.1874
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