polytrochaladj.

Brit.

/pəˈlɪtrəkl/,

/ˌpɒlɪˈtrəʊkl/, U.S.

/pəˈlɪtrək(ə)l/,

/ˌpɑliˈtroʊk(ə)l/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Polytrocha , -al suffix¹.

Etymology: < scientific Latin Polytrocha, former family name ( C. G. Ehrenberg Organisation, Systematik u. geographisches Verhältniss der Infusionsthierchen (1830) i. 65; < poly- poly- comb. form + ancient Greek τροχός wheel: see trocho- comb. form) + -al suffix¹.

Zoology.

†1. Of or relating to the former division Polytrocha of rotifers having more than one crown of cilia on the head. Obsolete. rare.Apparently only attested in dictionaries or glossaries.

ΚΠ

1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1004/1 Polytrochus, applied by G. C. Ehrenberg to two Families..of the Infusoria Rotifera, having many crowns of hairs: polytrochous.

2. Of a polychaete larva: having several ciliated rings round the body.

ΚΠ

1878 F. J. Bell & E. R. Lankester tr. C. Gegenbaur Elements Compar. Anat. 137 The larvæ of the Chætopoda are divided into mesotrochal, telotrochal, and polytrochal [Ger. polytroche] forms.

1940 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 6) 349 In some cases the pre-oral circlet is absent and the post-oral is situated about the middle of the body (mesotrochal), or there may be several between the mouth and anal end (polytrochal).

1956 A. C. Hardy Open Sea x. 184 As new segments of the developing worm are formed hanging below the trochophore body..each is provided with a new ciliated band of its own to assist in its support: the larva has reached the ‘polytrochal’ stage.

1984 Philos. Trans. (Royal Soc.) B. 306 131 (caption) A hypothetical scheme for the conversion of the nerves supplying three circumferential trochal bands..in a primitive polytrochal larva.

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

单词	polytrochal
释义	polytrochaladj. Brit. /pəˈlɪtrəkl/, /ˌpɒlɪˈtrəʊkl/, U.S. /pəˈlɪtrək(ə)l/, /ˌpɑliˈtroʊk(ə)l/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Polytrocha , -al suffix¹. Etymology: < scientific Latin Polytrocha, former family name ( C. G. Ehrenberg Organisation, Systematik u. geographisches Verhältniss der Infusionsthierchen (1830) i. 65; < poly- poly- comb. form + ancient Greek τροχός wheel: see trocho- comb. form) + -al suffix¹. Zoology. †1. Of or relating to the former division Polytrocha of rotifers having more than one crown of cilia on the head. Obsolete. rare.Apparently only attested in dictionaries or glossaries. ΚΠ 1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1004/1 Polytrochus, applied by G. C. Ehrenberg to two Families..of the Infusoria Rotifera, having many crowns of hairs: polytrochous. 2. Of a polychaete larva: having several ciliated rings round the body. ΚΠ 1878 F. J. Bell & E. R. Lankester tr. C. Gegenbaur Elements Compar. Anat. 137 The larvæ of the Chætopoda are divided into mesotrochal, telotrochal, and polytrochal [Ger. polytroche] forms. 1940 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 6) 349 In some cases the pre-oral circlet is absent and the post-oral is situated about the middle of the body (mesotrochal), or there may be several between the mouth and anal end (polytrochal). 1956 A. C. Hardy Open Sea x. 184 As new segments of the developing worm are formed hanging below the trochophore body..each is provided with a new ciliated band of its own to assist in its support: the larva has reached the ‘polytrochal’ stage. 1984 Philos. Trans. (Royal Soc.) B. 306 131 (caption) A hypothetical scheme for the conversion of the nerves supplying three circumferential trochal bands..in a primitive polytrochal larva. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < adj.1858
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