Malpighian tubule 
noun Zoology
A tubular excretory organ, numbers of which open into the gut in insects and some other arthropods.This process has now been implicated in the function of Malpighian tubules, rectum and midgut of a variety of insects....
- The excretory system is composed of a dorsal excretory gland and a pair of Malpighian tubules.
- Excretion of nitrogenous waste takes place through Malpighian tubules.
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