Source : Webster's Revised Unabridged Dictionary (1913)

Sweetbrier \Sweet"bri`er\, n. (Bot.)
   A kind of rose ({Rosa rubiginosa}) with minutely glandular
   and fragrant foliage. The small-flowered sweetbrier is {Rosa
   micrantha}.

Source : WordNet®

sweetbrier
     n : Eurasian rose with prickly stems and fragrant leaves and
         bright pink flowers followed by scarlet hips [syn: {sweetbriar},
          {brier}, {briar}, {eglantine}, {Rosa eglanteria}]