What does "privet" mean?

Privet: An ornamental European shrub (Ligustrum vulgare), much used in hedges; -- called also prim. 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.