(Ligustrum vulgare)

from The Collaborative International Dictionary of English v.0.48

Ligustrin \Li*gus"trin\ (l[-i]*g[u^]s"tr[i^]n), n. (Chem.)
   A bitter principle found in the bark of the privet
   {(Ligustrum vulgare)}, and extracted as a white crystalline
   substance with a warm, bitter taste; -- called also
   {ligustron}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Privet \Priv"et\, n. [Cf. Scot. privie, Prov. E. prim-print,
   primwort. Prob. for primet, and perh. named from being cut
   and trimmed. See, {Prim}, a., and cf. {Prime} to prune,
   {Prim}, n., {Prie}, n.] (Bot.)
   An ornamental European shrub ({Ligustrum vulgare}), much used
   in hedges; -- called also {prim}.
   [1913 Webster]

   {Egyptian privet}. See {Lawsonia}.

   {Evergreen privet}, a plant of the genus {Rhamnus}. See
      {Alatern}.

   {Mock privet}, any one of several evergreen shrubs of the
      genus {Phillyrea}. They are from the Mediterranean region,
      and have been much cultivated for hedges and for
      fancifully clipped shrubberies.
      [1913 Webster]