nephridium


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. (ANNELIDA: Oligochaeta)
A segment essentially composed of excretory tubules that may discharge directly onto the body surface, or lead to a sinus discharging to the exterior through pores by the setal ring.
3. (ECHIURA)
One to many organs used for the temporary storage of eggs and sperm.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • 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 — 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

  • nephridium — 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] * * * ne·phrid·i·um ni frid ē əm n, pl ia ē ə an excretory organ that is… …   Medical dictionary


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