The Collaborative International Dictionary of English v.0.48:

gipsywort \gipsywort\ n.
   A hairy Eurasian herb (Lycopus europaeus) with two-lipped
   white flowers.

   Syn: gypsywort, Lycopus europaeus.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Gypsywort \Gyp"sy*wort`\ (j[i^]p"s[i^]*w[^u]rt`), n. (Bot.)
   A labiate plant (the Lycopus Europ[ae]us). Gypsies are said
   to stain their skin with its juice.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Lycopus europaeus
    n 1: hairy Eurasian herb with two-lipped white flowers [syn:
         gipsywort, gypsywort, Lycopus europaeus]