rhizodontn.adj.

Brit.

/ˈrʌɪzəʊdɒnt/, U.S.

/ˈraɪzoʊdɑnt/

Origin: Formed within English, by compounding; modelled on a Latin lexical item. Etymons: rhizo- comb. form, -odont comb. form.

Etymology: < rhizo- comb. form + -odont comb. form, after scientific Latin Rhizodonta, former order name ( C. L. Bonaparte Selachorum tabula analytica (1838) 15). With the use in relation to fishes, compare scientific Latin Rhizodus, genus name ( R. Owen Odontography (1840) I. 75).

Zoology and Palaeontology.

A. n.

An animal of a group characterized by teeth attached to the jaw by roots: †(a) a reptile of the former order Rhizodonta, comprising crocodilians and their fossil relatives (obsolete); (b) a fish of the extinct family Rhizodontidae of rhipidistian fishes having sharp, rooted teeth.

ΘΚΠ

the world > animals > reptiles > [noun] > reptile > having teeth with branching fangs

rhizodont1847

1847 L. Agassiz Introd. Study Nat. Hist. xii. 57/2 We do not find batrachians first, but reptiles allied to the crocodile—the Rhizodonts—which indicate, by their character and form, a likeness to Mammalia.

1883 S. Garman Reptiles & Batrachians N. Amer. Introd. p. ix The Rhizodonts are long lived; the young grow rapidly, adults more slowly.

1900 Nature 20 Sept. 506/1 We are..justified in considering the Holoptychians..a newer type than the Rhizodonts.

1998 Nature 6 Aug. 569 Here we present..the most primitive and by far the most complete rhizodont discovered so far.

2002 J. A. Clack Gaining Ground iii. 60 Rhizodonts..are known from the middle of the Devonian period to the end of the Carboniferous. They are most notable for having produced the largest bony-fish predators of their day.

B. adj.

Originally: of or relating to the possession of teeth attached to the jaw by roots. In later use: spec. of or relating to the extinct fish family Rhizodontidae.

ΘΚΠ

the world > animals > animal body > general parts > head and neck > [adjective] > having teeth > resembling fangs > having fangs > having teeth with branching fangs

rhizodont1851

1851 S. F. Baird tr. J. G. Heck Iconogr. Encycl. II. Zool. 282 The most striking feature consists in the rhizodont character of the teeth.

1900 Nature 20 Sept. 505/2 The Rhizodont genera Tristichopterus and Eusthenopteron.

1985 Trans. Royal Soc. Edinb. Earth Sci. 76 67 Ways in which variously shaped rhizodont teeth..may have functioned are suggested.

1998 Nature 6 Aug. 569 The pectoral fin of the rhizodont sarcopterygian Sauripteris is strikingly limb-like.

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	rhizodont
释义	rhizodontn.adj. Brit. /ˈrʌɪzəʊdɒnt/, U.S. /ˈraɪzoʊdɑnt/ Origin: Formed within English, by compounding; modelled on a Latin lexical item. Etymons: rhizo- comb. form, -odont comb. form. Etymology: < rhizo- comb. form + -odont comb. form, after scientific Latin Rhizodonta, former order name ( C. L. Bonaparte Selachorum tabula analytica (1838) 15). With the use in relation to fishes, compare scientific Latin Rhizodus, genus name ( R. Owen Odontography (1840) I. 75). Zoology and Palaeontology. A. n. An animal of a group characterized by teeth attached to the jaw by roots: †(a) a reptile of the former order Rhizodonta, comprising crocodilians and their fossil relatives (obsolete); (b) a fish of the extinct family Rhizodontidae of rhipidistian fishes having sharp, rooted teeth. ΘΚΠ the world > animals > reptiles > [noun] > reptile > having teeth with branching fangs rhizodont1847 1847 L. Agassiz Introd. Study Nat. Hist. xii. 57/2 We do not find batrachians first, but reptiles allied to the crocodile—the Rhizodonts—which indicate, by their character and form, a likeness to Mammalia. 1883 S. Garman Reptiles & Batrachians N. Amer. Introd. p. ix The Rhizodonts are long lived; the young grow rapidly, adults more slowly. 1900 Nature 20 Sept. 506/1 We are..justified in considering the Holoptychians..a newer type than the Rhizodonts. 1998 Nature 6 Aug. 569 Here we present..the most primitive and by far the most complete rhizodont discovered so far. 2002 J. A. Clack Gaining Ground iii. 60 Rhizodonts..are known from the middle of the Devonian period to the end of the Carboniferous. They are most notable for having produced the largest bony-fish predators of their day. B. adj. Originally: of or relating to the possession of teeth attached to the jaw by roots. In later use: spec. of or relating to the extinct fish family Rhizodontidae. ΘΚΠ the world > animals > animal body > general parts > head and neck > [adjective] > having teeth > resembling fangs > having fangs > having teeth with branching fangs rhizodont1851 1851 S. F. Baird tr. J. G. Heck Iconogr. Encycl. II. Zool. 282 The most striking feature consists in the rhizodont character of the teeth. 1900 Nature 20 Sept. 505/2 The Rhizodont genera Tristichopterus and Eusthenopteron. 1985 Trans. Royal Soc. Edinb. Earth Sci. 76 67 Ways in which variously shaped rhizodont teeth..may have functioned are suggested. 1998 Nature 6 Aug. 569 The pectoral fin of the rhizodont sarcopterygian Sauripteris is strikingly limb-like. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < n.adj.1847
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