protonephridiumn.

Brit.

/ˌprəʊtə(ʊ)nᵻˈfrɪdɪəm/, U.S.

/ˈˌproʊdoʊnəˈfrɪdiəm/

Inflections: Plural protonephridia.

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

Etymology: < proto- comb. form + nephridium n., after scientific Latin protonephridium ( B. Hatschek Lehrb. der Zool. (1889) II. 160).

Zoology.

A branched, blind-ended nephridium containing flame cells (as in flatworms and nemertines) or solenocytes (as in some annelids); a nephridium of this type found in the larvae of other animal groups. Cf. metanephridium n.

ΘΚΠ

the world > animals > invertebrates > bodies or parts > [noun] > excretory organ or system > larval

protonephridium1891

1891 Amer. Naturalist 25 1140 This applies to the nervous system, digestive tract, muscles, and the proto-nephridia, but not to the gonads.

1900 Q. Jrnl. Microsc. Sci. 43 742 For its [sc. the nephridium's] closed representation..and for closed ‘head-kidneys’, the term Protonephridium might, perhaps, be used with advantage. It is the name proposed by Hatschek for the closed nephridia of the Platyhelminths.

1930 Biol. Bull. 58 208 This type of excretory organ may be designated a metanephridium in order to distinguish it from the more usual type, protonephridium, found in nemerteans.

1967 E. J. W. Barrington Invertebr. Struct. & Function xii. 236 The nephridium occurs in two main forms, the protonephridium and the metanephridium.

1995 R. Gibson & E. W. Knight-Jones in P. J. Hayward & J. S. Ryland Handbk. Marine Fauna N.W. Europe v. 136 These ‘flatworms’ are bilaterally symmetrical, with marked cephalization, mostly with a mouth, gut, and protonephridia.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protonephridium
释义	protonephridiumn. Brit. /ˌprəʊtə(ʊ)nᵻˈfrɪdɪəm/, U.S. /ˈˌproʊdoʊnəˈfrɪdiəm/ Inflections: Plural protonephridia. Origin: Formed within English, by compounding; modelled on a Latin lexical item. Etymons: proto- comb. form, nephridium n. Etymology: < proto- comb. form + nephridium n., after scientific Latin protonephridium ( B. Hatschek Lehrb. der Zool. (1889) II. 160). Zoology. A branched, blind-ended nephridium containing flame cells (as in flatworms and nemertines) or solenocytes (as in some annelids); a nephridium of this type found in the larvae of other animal groups. Cf. metanephridium n. ΘΚΠ the world > animals > invertebrates > bodies or parts > [noun] > excretory organ or system > larval protonephridium1891 1891 Amer. Naturalist 25 1140 This applies to the nervous system, digestive tract, muscles, and the proto-nephridia, but not to the gonads. 1900 Q. Jrnl. Microsc. Sci. 43 742 For its [sc. the nephridium's] closed representation..and for closed ‘head-kidneys’, the term Protonephridium might, perhaps, be used with advantage. It is the name proposed by Hatschek for the closed nephridia of the Platyhelminths. 1930 Biol. Bull. 58 208 This type of excretory organ may be designated a metanephridium in order to distinguish it from the more usual type, protonephridium, found in nemerteans. 1967 E. J. W. Barrington Invertebr. Struct. & Function xii. 236 The nephridium occurs in two main forms, the protonephridium and the metanephridium. 1995 R. Gibson & E. W. Knight-Jones in P. J. Hayward & J. S. Ryland Handbk. Marine Fauna N.W. Europe v. 136 These ‘flatworms’ are bilaterally symmetrical, with marked cephalization, mostly with a mouth, gut, and protonephridia. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1891
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