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any jumping louse of the family Pysllidae, often a pest of fruit trees.
[< New Latin Psylla (1811), genus name < Greek psýlla flea]
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|Noun||1.||psylla - small active cicada-like insect with hind legs adapted for leaping; feeds on plant juices|
plant louse, louse - any of several small insects especially aphids that feed by sucking the juices from plants