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]

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ne·phrid·i·um ni-'frid-ē-əm n, pl -ia -ē-ə an excretory organ that is characteristic of various coelomate invertebrates (as annelid worms, mollusks, brachiopods, and some arthropods), occurs paired in each body segment or as a single pair serving the whole body, typically consists of a tube opening at one end into the coelom and discharging at the other end on the exterior of the body, is often lengthened and convoluted, and has glandular walls
ne·phrid·i·al -ē-əl adj

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ne·phrid·i·um (nə-fridґe-əm) one of the segmentally arranged, paired, tubular excretory organs in invertebrates, analogous to the vertebrate kidney.

Medical dictionary. 2011.

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  • Nephridium — Ne*phrid i*um, n.; pl. {Nephridia}. [NL., fr. Gr. ? of the kidneys.] (Zo[ o]l. & Anat.) A segmental tubule; one of the tubules of the primitive urinogenital organs; a segmental organ. See Illust. under {Loeven s larva}. [1913 Webster] …   The Collaborative International Dictionary of English

  • nephridium — (n.) (pl. nephridia), 1877, Modern Latin, from Greek dim. of nephros kidney (see NEPHRON (Cf. nephron)) …   Etymology dictionary

  • nephridium — [nə frid′ē əm] n. pl. nephridia [nē frid′ēə, ni frid′ēə, ne frid′ēə] [ModL < Gr nephridion, dim. of nephros, kidney: see NEPHRO ] 1. a waste discharging tubule with an external excretory pore, found in many invertebrates, as in worms, mollusks …   English World dictionary

  • Nephridium — A Nephridium (plural nephridia) is an invertebrate organ which occurs in pairs and function similar to kidneys. Nephridia remove metabolic wastes from an animal s body. They are present in many different invertebrate lines. There are two basic… …   Wikipedia

  • Nephridium — Als Nephridium (gr. nephros – Niere) bezeichnet man ein Organ zur Ausscheidung giftiger Abbauprodukte. Im Tierreich gibt es mehrere Typen von Nephridien: Protonephridien: Sie sind die einfachsten Ausscheidungsorgane und kommen hauptsächlich bei… …   Deutsch Wikipedia

  • nephridium — noun (plural nephridia) Etymology: New Latin Date: 1877 a tubular glandular excretory organ characteristic of various invertebrates • nephridial adjective …   New Collegiate Dictionary

  • nephridium — small excretory organs with flame cells found in invertebrates and Amphioxi …   Dictionary of ichthyology

  • nephridium — n.; pl. ia [Gr. dim. nephros, kidney; L. ium, nature of] 1. In various invertebrates, simple or branched, tubular structures that function in excretion, opening to the outside through a nephridiopore; see protonephridium, metanephridium. 2.… …   Dictionary of invertebrate zoology

  • nephridium — nephridial, adj. /neuh frid ee euhm/, n., pl. nephridia / frid ee euh/. Zool. the excretory organ of many invertebrates, consisting of a tubule with one end opening into the body cavity and the other opening into a pore at the body surface. [1875 …   Universalium

  • nephridium — noun a) A tubular excretory organ in some invertebrates b) The embryonic excretory organ that developes into the kidney …   Wiktionary

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