WATER TUBE
\wˈɔːtə tjˈuːb], \wˈɔːtə tjˈuːb], \w_ˈɔː_t_ə t_j_ˈuː_b]\
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One of a system of tubular excretory organs having external openings, found in many invertebrates. They are believed to be analogous in function to the kidneys of vertebrates. See Illust. under Trematodea, and Sporocyst.
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Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.