one of a group of long, slender excretory tubules at the anterior end of the hindgut in insects and other terrestrial arthropods.
Also called Malpighian tubule, Malpighian vessel.
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British Dictionary definitions for malpighian tubules
organs of excretion in insects and many other arthropods: narrow tubules opening into the anterior part of the hindgut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012