Source : Webster's Revised Unabridged Dictionary (1913)

Apocynin \A*poc"y*nin\, n. [From Apocynum, the generic name of
   dogbane.] (Chem.)
   A bitter principle obtained from the dogbane ({Apocynum
   cannabinum}).

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®

Apocynum cannabinum
     n : Canadian dogbane yielding a tough fiber used as cordage by
         native Americans; used in folk medicine for pain or
         inflammation in joints [syn: {Indian hemp}, {rheumatism
         weed}]