plant louse
noun
1.
aphid
.
2.
any of various related insects having similar habits.
Origin
1795-1805
British Dictionary definitions for
plant louse
plant louse
noun
1.
another name for an
aphid
2.
jumping plant louse,
any small active cicada-like insect of the homopterous family
Psyllidae
(or
Chermidae
), having hind legs adapted for leaping, and feeding on plant juices