plural noun
Phyl·​lox·​er·​i·​dae | \ˌfiˌläkˈserəˌdē\

Definition of Phylloxeridae 

: a small family of destructive plant lice in which the wings when present are laid flat upon the abdomen when at rest — see phylloxera

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History and Etymology for Phylloxeridae

New Latin, from Phylloxera, type genus + -idae

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noxious or harmful

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