metanephridiumn.
/ˌmɛtənᵻˈfrɪdɪəm/, /ˌmɛtənɛˈfrɪdɪəm/, U.S. /ˌmɛdənəˈfrɪdiəm/, /ˈˌmɛdəˌnɛˈfrɪdiəm/ Zoology.
A nephridium that opens into the coelomic cavity, typically via a ciliated funnel. Cf. protonephridium n.
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the world > animals > invertebrates > bodies or parts > [noun] > excretory organ or system > opening into coelom
metanephridium1930
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.
1946 Q. Jrnl. Microsc. Sci. 86 119 This new name [sc. mixonephridium] is proposed to draw attention to the difference between these two kinds of organ (the metanephridium, and the compound nephromixial organ).
1967 E. J. W. Barrington Invertebr. Struct. & Function xii. 236 The nephridium occurs in two main forms, the protonephridium and the metanephridium.
1995 C. Nielsen Animal Evol. i. 4 The presence of ‘advanced’ characters, such as coelom and metanephridia, has been used to characterize higher taxa without discussing the possibility that these characters could have evolved a number of times.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).
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n.1930- muscle reading
- muscle relaxant
- muscle relaxation
- muscle rigidity
- muscle rod
- muscle scar
- muscle sense
- muscle serum
- muscle shirt
- muscle spindle
- muscle strain
- muscle sugar
- muscle tension
- muscle tissue
- muscle tone
- muscle toning
- muscle tumour
- muscle twitch
- muscle up
- muscle work
- muscle-acid
- muscle-bound
- muscle-box
- muscle-building
- muscle-case