[1] : The Collaborative International Dictionary of English v.0.48

eglantine \eg"lantine\, n. f. 'eglantine, fr. of. aiglent
   brier, hip tree, fr. assumed ll. acuculentus, fr. a dim. of
   l. acus needle; cf. f. aiguille needle. cf. aglet. bot.
   a a species of rose rosa eglanteria, with fragrant
       foliage and flowers of various colors.
   b the sweetbrier r. rubiginosa.
       1913 webster

   note: milton, in the following lines, has applied the name to
         some twining plant, perhaps the honeysuckle.
         1913 webster

               through the sweetbrier, or the vine,
               or the twisted eglantine.          --l'allegro,
                                                  47.
         "in our early writers and in gerarde and the
         herbalists, it was a shrub with white flowers." --dr.
         prior.
         1913 webster
see also:
aglet rosa eglanteria r. rubiginosa 

[2] : WordNet (r) 2.0

rosa eglanteria
     n : eurasian rose with prickly stems and fragrant leaves and
         bright pink flowers followed by scarlet hips syn: sweetbrier,
          sweetbriar, brier, briar, eglantine
see also:
sweetbrier sweetbriar brier briar eglantine 

Rosa >> R Words
Rosa, definition of term: Rosa
rosa_pag1.html

Sub Rosa >> S Words
Sub Rosa, definition of term: Sub Rosa
sub+rosa_pag1.html

Santa Rosa >> S Words
Santa Rosa, definition of term: Santa Rosa
santa+rosa_pag1.html