planariann.adj.

Brit.

/pləˈnɛːrɪən/, U.S.

/pləˈnɛriən/

Forms: also formerly with upper-case initial.

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Planaria , -an suffix.

Etymology: < scientific Latin Planaria (see Planaria n.) + -an suffix.

Zoology.

A. n.

Originally: a flatworm of the general type represented by Planaria; a turbellarian, esp. one with a branched gut. Now: spec. any of numerous free-living turbellarian flatworms comprising the order Tricladida, found in fresh or salt water or in moist earth, having flattened bodies and great powers of regeneration.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Turbellaria > member of division Triclada or Tricladida > genus Planaria > member of

planarian1854

1854 C. Girard (title) Researches upon Nemerteans and Planarians.

1864 T. S. Cobbold Entozoa i. 9 All the true Planarians (Dendrocœla) display a branched digestive tube.

1876 P. J. Van Beneden Animal Parasites & Messmates 46 According to Agassiz, a species of Planarian [Fr. espèce de Planaire] lives as a free messmate on the lower surface of the Limulus.

1900 Daily Chron. 30 Oct. 3/4 These Planarians or Turbellarians for the most part slay and kill as much as do their parasitic allies.

2003 Coloradoan (Fort Collins) (Nexis) 18 Apr. 11 e Famous for cartoonish eyespots and growing two heads when split with a scalpel, planarians live their lives beneath stones and leaves in streams and ponds.

B. adj.

Of, relating to, characteristic of, or designating a planarian or planarians.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [adjective] > of or belonging to class Turbellaria > belonging to division Tricladida > belonging or related to genus Planaria

planarian1858

1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Planarius, planarian.

1862 Trans. Amer. Philos. Soc. 12 25 The sandstone..is often broken into immense tabular masses, the surfaces of which are covered with trails of Planarian worms or mollusks.

1877 T. H. Huxley Man. Anat. Invertebrated Animals iv. 182 The body takes on the ordinary Planarian character.

1960 Symp. Soc. Exper. Biol. 14 18 A segment of planarian worm will grow into a complete worm.

2003 Chron. Higher Educ. (Nexis) 31 Jan. 17 A planarian eye cell can be only an eye cell... But unlike us, planarians carry a population of undifferentiated cells—ones that have not yet specialized—that..can form any of the body's tissues.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	planarian
释义	planariann.adj. Brit. /pləˈnɛːrɪən/, U.S. /pləˈnɛriən/ Forms: also formerly with upper-case initial. Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Planaria , -an suffix. Etymology: < scientific Latin Planaria (see Planaria n.) + -an suffix. Zoology. A. n. Originally: a flatworm of the general type represented by Planaria; a turbellarian, esp. one with a branched gut. Now: spec. any of numerous free-living turbellarian flatworms comprising the order Tricladida, found in fresh or salt water or in moist earth, having flattened bodies and great powers of regeneration. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Turbellaria > member of division Triclada or Tricladida > genus Planaria > member of planarian1854 1854 C. Girard (title) Researches upon Nemerteans and Planarians. 1864 T. S. Cobbold Entozoa i. 9 All the true Planarians (Dendrocœla) display a branched digestive tube. 1876 P. J. Van Beneden Animal Parasites & Messmates 46 According to Agassiz, a species of Planarian [Fr. espèce de Planaire] lives as a free messmate on the lower surface of the Limulus. 1900 Daily Chron. 30 Oct. 3/4 These Planarians or Turbellarians for the most part slay and kill as much as do their parasitic allies. 2003 Coloradoan (Fort Collins) (Nexis) 18 Apr. 11 e Famous for cartoonish eyespots and growing two heads when split with a scalpel, planarians live their lives beneath stones and leaves in streams and ponds. B. adj. Of, relating to, characteristic of, or designating a planarian or planarians. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [adjective] > of or belonging to class Turbellaria > belonging to division Tricladida > belonging or related to genus Planaria planarian1858 1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) Planarius, planarian. 1862 Trans. Amer. Philos. Soc. 12 25 The sandstone..is often broken into immense tabular masses, the surfaces of which are covered with trails of Planarian worms or mollusks. 1877 T. H. Huxley Man. Anat. Invertebrated Animals iv. 182 The body takes on the ordinary Planarian character. 1960 Symp. Soc. Exper. Biol. 14 18 A segment of planarian worm will grow into a complete worm. 2003 Chron. Higher Educ. (Nexis) 31 Jan. 17 A planarian eye cell can be only an eye cell... But unlike us, planarians carry a population of undifferentiated cells—ones that have not yet specialized—that..can form any of the body's tissues. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.adj.1854
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