The Collaborative International Dictionary of English v.0.48:

Silene \Si*le"ne\, n. [NL., fr. L. Silenus, the attendant of
   Bacchus.] (Bot.)
   A genus of caryophyllaceous plants, usually covered with a
   viscid secretion by which insects are caught; catchfly.
   [1913 Webster]

   Bon Sil[`e]ne. See Sil[`e]ne, in the Vocabulary.
      [1913 Webster]

WordNet (r) 3.0 (2006):

silene
    n 1: any plant of the genus Silene [syn: silene, campion,
         catchfly]