\Phyl`lox*e"ra\, n. [NL., fr. Gr. ? leaf + ? dry.]
1. (Zo["o]l.) A small hemipterous insect ({Phylloxera
   vastatrix}) allied to the aphids. It attacks the roots and
   leaves of the grapevine, doing great damage, especially in
   Europe.
Note: It exists in several forms, some of which are winged,
      other wingless. One form produces galls on the leaves
      and twigs, another affects the roots, causing galls or
      swellings, and often killing the vine.
2. The diseased condition of a vine caused by the insect just
   described.