any of numerous, variously colored web-spinning mites of the family Tetranychidae, many of which are pests of garden plants and fruit trees.
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British Dictionary definitions for spider mite
any of various plant-feeding mites of the family Tetranychidae, esp Panonychus ulmi (red spider mite), which is a serious orchard pest
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