plant louse

noun

Definition of plant louse 

: aphid also : any of various small insects (such as a jumping plant louse) of similar habits

First Known Use of plant louse

1763, in the meaning defined above

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The first known use of plant louse was in 1763

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More Definitions for plant louse

plant louse

noun

Kids Definition of plant louse

: aphid

More from Merriam-Webster on plant louse

Britannica.com: Encyclopedia article about plant louse

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