unionoidadj.n.

Brit.

/ˈjuːnɪənɔɪd/, U.S.

/ˈjunjəˌnɔɪd/

Origin: A borrowing from Latin, combined with an English element; modelled on a Latin lexical item. Etymons: Latin Unio , -oid suffix.

Etymology: < scientific Latin Unio unio n. + -oid suffix, with insertion of -n- after classical Latin ūniōn-, ūniō, etymon of the first element. Compare scientific Latin Unionioda , order name (1958 or earlier). Compare earlier unionid n.

Zoology.

A. adj.

Of or relating to the family Unionidae of freshwater mussels, or the order Unionoida in which they are included; unioniform.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Pelecypoda or Conchifera > [adjective] > of, belonging to, or resembling the Unionidae

unioniform1829

hippurite1831

unioid1861

unionoid1879

1879 H. A. Nicholson Man. Palæontol. (ed. 2) I. 492 Unionoid Bivalves, with thick shells.

1914 C. T. Simpson Descriptive Catal. Naiades 456 It is, I am satisfied, an unionoid animal.

2011 B. P. Kear & R. J. Hamilton-Bruce Dinosaurs Austral. vi. 112/1 These have produced freshwater unionoid bivalves.

B. n.

A mollusc of the family Unionidae or order Unionoida; a freshwater mussel.

ΚΠ

1891 Cent. Dict. (at cited word) Same as unionid.

1911 Nature 26 Jan. 429/1 The ornament and dentition of Unionoids show relationship to Trigonids.

2008 G. Giribet in W. F. Ponder & D. R. Lindberg Phylogeny & Evol. Mollusca vi. 108/2 The larvae of unionoids..are parasitic on fishes and, in large numbers, can (although rarely) affect the health of the host.

This entry has been updated (OED Third Edition, September 2015; most recently modified version published online March 2022).

单词	unionoid
释义	unionoidadj.n. Brit. /ˈjuːnɪənɔɪd/, U.S. /ˈjunjəˌnɔɪd/ Origin: A borrowing from Latin, combined with an English element; modelled on a Latin lexical item. Etymons: Latin Unio , -oid suffix. Etymology: < scientific Latin Unio unio n. + -oid suffix, with insertion of -n- after classical Latin ūniōn-, ūniō, etymon of the first element. Compare scientific Latin Unionioda , order name (1958 or earlier). Compare earlier unionid n. Zoology. A. adj. Of or relating to the family Unionidae of freshwater mussels, or the order Unionoida in which they are included; unioniform. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Pelecypoda or Conchifera > [adjective] > of, belonging to, or resembling the Unionidae unioniform1829 hippurite1831 unioid1861 unionoid1879 1879 H. A. Nicholson Man. Palæontol. (ed. 2) I. 492 Unionoid Bivalves, with thick shells. 1914 C. T. Simpson Descriptive Catal. Naiades 456 It is, I am satisfied, an unionoid animal. 2011 B. P. Kear & R. J. Hamilton-Bruce Dinosaurs Austral. vi. 112/1 These have produced freshwater unionoid bivalves. B. n. A mollusc of the family Unionidae or order Unionoida; a freshwater mussel. ΚΠ 1891 Cent. Dict. (at cited word) Same as unionid. 1911 Nature 26 Jan. 429/1 The ornament and dentition of Unionoids show relationship to Trigonids. 2008 G. Giribet in W. F. Ponder & D. R. Lindberg Phylogeny & Evol. Mollusca vi. 108/2 The larvae of unionoids..are parasitic on fishes and, in large numbers, can (although rarely) affect the health of the host. This entry has been updated (OED Third Edition, September 2015; most recently modified version published online March 2022). < adj.n.1879
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