Source : Webster's Revised Unabridged Dictionary (1913)

Nettle \Net"tle\, n. [AS. netele; akin to D. netel, G. nessel,
   OHG. nezz["i]la, nazza, Dan. nelde, n["a]lde, Sw. n["a]ssla;
   cf, Lith. notere.] (Bot.)
   A plant of the genus {Urtica}, covered with minute sharp
   hairs containing a poison that produces a stinging sensation.
   {Urtica gracitis} is common in the Northern, and {U.
   cham[ae]dryoides} in the Southern, United States. the common
   European species, {U. urens} and {U. dioica}, are also found
   in the Eastern united States. {U. pilulifera} is the Roman
   nettle of England.

   Note: The term nettle has been given to many plants related
         to, or to some way resembling, the true nettle; as:

   {Australian nettle}, a stinging tree or shrub of the genus
      {Laportea} (as {L. gigas} and {L. moroides}); -- also
      called {nettle tree}.

   {Bee nettle}, {Hemp nettle}, a species of {Galeopsis}. See
      under {Hemp}.

   {Blind nettle}, {Dead nettle}, a harmless species of
      {Lamium}.

   {False nettle} ({B[ae]hmeria cylindrica}), a plant common in
      the United States, and related to the true nettles.

   {Hedge nettle}, a species of {Stachys}. See under {Hedge}.

   {Horse nettle} ({Solanum Carolinense}). See under {Horse}.

   {nettle tree}.
   (a) Same as {Hackberry}.
   (b) See {Australian nettle} (above).

   {Spurge nettle}, a stinging American herb of the Spurge
      family ({Jatropha urens}).

   {Wood nettle}, a plant ({Laportea Canadensis}) which stings
      severely, and is related to the true nettles.

   {Nettle cloth}, a kind of thick cotton stuff, japanned, and
      used as a substitute for leather for various purposes.

   {Nettle rash} (Med.), an eruptive disease resembling the
      effects of whipping with nettles.

   {Sea nettle} (Zo["o]l.), a medusa.

Hemp \Hemp\ (h[e^]mp), n. [OE. hemp, AS. henep, h[ae]nep; akin
   to D. hennep, OHG. hanaf, G. hanf, Icel. hampr, Dan. hamp,
   Sw. hampa, L. cannabis, cannabum, Gr. ka`nnabis, ka`nnabos;
   cf. Russ. konoplia, Skr. [,c]a[.n]a; all prob. borrowed from
   some other language at an early time. Cf. {Cannabine},
   {Canvas}.]
   1. (Bot.) A plant of the genus {Cannabis} ({C. sativa}), the
      fibrous skin or bark of which is used for making cloth and
      cordage. The name is also applied to various other plants
      yielding fiber.

   2. The fiber of the skin or rind of the plant, prepared for
      spinning. The name has also been extended to various
      fibers resembling the true hemp.

   {African hemp}, {Bowstring hemp}. See under {African}, and
      {Bowstring}.

   {Bastard hemp}, the Asiatic herb {Datisca cannabina}.

   {Canada hemp}, a species of dogbane ({Apocynum cannabinum}),
      the fiber of which was used by the Indians.

   {Hemp agrimony}, a coarse, composite herb of Europe
      ({Eupatorium cannabinum}), much like the American boneset.
      

   {Hemp nettle}, a plant of the genus {Galeopsis} ({G.
      Tetrahit}), belonging to the Mint family.

   {Indian hemp}. See under {Indian}, a.

   {Manila hemp}, the fiber of {Musa textilis}.

   {Sisal hemp}, the fiber of {Agave sisalana}, of Mexico and
      Yucatan.

   {Sunn hemp}, a fiber obtained from a leguminous plant
      ({Crotalaria juncea}).

   {Water hemp}, an annual American weed ({Acnida cannabina}),
      related to the amaranth.

Source : WordNet®

hemp nettle
     n : coarse bristly Eurasian plant with white or reddish flowers
         and foliage resembling that of a nettle; common as a weed
         in United States [syn: {dead nettle}, {Galeopsis tetrahit}]