nephridium

ne·phrid·i·um

N0061700 (nə-frĭd′ē-əm)n. pl. ne·phrid·i·a (-ē-ə) 1. A tubular excretory organ in many invertebrates, such as mollusks and earthworms.2. The excretory organ of a vertebrate embryo from which the kidney develops.

[nephr(o)- + Latin -idium, diminutive suff. (from Greek -idion).]

ne·phrid′i·al adj.

nephridium

(nɪˈfrɪdɪəm) n, pl -ia (-ɪə) (Zoology) a simple excretory organ of many invertebrates, consisting of a tube through which waste products pass to the exterior[C19: New Latin: little kidney] neˈphridial adj

ne•phrid•i•um

(nəˈfrɪd i əm)

n., pl. -phrid•i•a (-ˈfrɪd i ə) an excretory tubule in annelids, mollusks, and other invertebrates that discharges wastes from the body cavity through a pore on the body surface. [1875–80; < Greek nephr(ós) kidney] ne•phrid′i•al, adj.

Nephridium

enUK

nephridium

[nə′frid·ē·əm] (invertebrate zoology) Any of various paired excretory structures present in the Platyhelminthes, Rotifera, Rhynchocoela, Acanthocephala, Priapuloidea, Entoprocta, Gastrotricha, Kinorhyncha, Cephalochorda, and some Archiannelida and Polychaeta.

Nephridium

an excretory organ that is characteristic of invertebrates. The nephridium regulates osmotic pressure, extracts and removes harmful metabolites from the body, and sometimes transports gonad products. The most primitive nephridia are those of flatworms, rotifers, gastrotrichs, nemerteans, and some polychaetes. These nephridia, which are called protonephridia, are branched tubules of ectodermal origin. They are closed at the internal ends by terminal cells, or solenocytes, and open to the exterior by means of excretory pores, or nephridiopores. Upon losing its solenocytes and opening into the coelom, the protonephridium is transformed into a metanephridium (primarily in annelids). In some annelids the nephridium coalesces with the mesodermal ciliated gonad funnels, or coelomo-ducts, forming an organ of mixed origin, the nephromyxium.

A. V. IVANOV

nephridium

ne·phrid·i·um

, pl.

ne·phrid·i·a

(ne-frid'ē-ŭm, -ă), One of the paired, segmentally arranged excretory tubules of invertebrates such as the annelids. [G. nephros, kidney, + Mod. L. -idium, dim. suffix, fr. G. -idion]

nephridium

(nə-frĭd′ē-əm)n. pl. nephrid·ia (-ē-ə) 1. A tubular excretory organ in many invertebrates, such as mollusks and earthworms.2. The excretory organ of a vertebrate embryo from which the kidney develops.

ne·phrid′i·al adj.

nephridium

(pl. nephridia) a primitive excretory organ present in many invertebrates (e.g. the earthworm) in the form of a tube which opens at one end to the exterior. The other end may open into the COELOM or may terminate in a FLAME CELL.

单词	nephridium
释义	nephridium enUK ne·phrid·i·um N0061700 (nə-frĭd′ē-əm)n. pl. ne·phrid·i·a (-ē-ə) 1. A tubular excretory organ in many invertebrates, such as mollusks and earthworms.2. The excretory organ of a vertebrate embryo from which the kidney develops. [nephr(o)- + Latin -idium, diminutive suff. (from Greek -idion).] ne·phrid′i·al adj. nephridium (nɪˈfrɪdɪəm) n, pl -ia (-ɪə) (Zoology) a simple excretory organ of many invertebrates, consisting of a tube through which waste products pass to the exterior[C19: New Latin: little kidney] neˈphridial adj ne•phrid•i•um (nəˈfrɪd i əm) n., pl. -phrid•i•a (-ˈfrɪd i ə) an excretory tubule in annelids, mollusks, and other invertebrates that discharges wastes from the body cavity through a pore on the body surface. [1875–80; < Greek nephr(ós) kidney] ne•phrid′i•al, adj. Nephridium enUK nephridium [nə′frid·ē·əm] (invertebrate zoology) Any of various paired excretory structures present in the Platyhelminthes, Rotifera, Rhynchocoela, Acanthocephala, Priapuloidea, Entoprocta, Gastrotricha, Kinorhyncha, Cephalochorda, and some Archiannelida and Polychaeta. Nephridium an excretory organ that is characteristic of invertebrates. The nephridium regulates osmotic pressure, extracts and removes harmful metabolites from the body, and sometimes transports gonad products. The most primitive nephridia are those of flatworms, rotifers, gastrotrichs, nemerteans, and some polychaetes. These nephridia, which are called protonephridia, are branched tubules of ectodermal origin. They are closed at the internal ends by terminal cells, or solenocytes, and open to the exterior by means of excretory pores, or nephridiopores. Upon losing its solenocytes and opening into the coelom, the protonephridium is transformed into a metanephridium (primarily in annelids). In some annelids the nephridium coalesces with the mesodermal ciliated gonad funnels, or coelomo-ducts, forming an organ of mixed origin, the nephromyxium. A. V. IVANOV nephridium enUK ne·phrid·i·um , pl. ne·phrid·i·a (ne-frid'ē-ŭm, -ă), One of the paired, segmentally arranged excretory tubules of invertebrates such as the annelids. [G. nephros, kidney, + Mod. L. -idium, dim. suffix, fr. G. -idion] nephridium (nə-frĭd′ē-əm)n. pl. nephrid·ia (-ē-ə) 1. A tubular excretory organ in many invertebrates, such as mollusks and earthworms.2. The excretory organ of a vertebrate embryo from which the kidney develops. ne·phrid′i·al adj. nephridium (pl. nephridia) a primitive excretory organ present in many invertebrates (e.g. the earthworm) in the form of a tube which opens at one end to the exterior. The other end may open into the COELOM or may terminate in a FLAME CELL.
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