Source : Webster's Revised Unabridged Dictionary (1913)

Catchfly \Catch"fly\, n. (Bot.)
   A plant with the joints of the stem, and sometimes other
   parts, covered with a viscid secretion to which small insects
   adhere. The species of {Silene} are examples of the catchfly.

Source : WordNet®

catchfly
     n 1: any plant of the genus Silene [syn: {silene}, {campion}]
     2: mostly perennial herbs with sticky stems that catch insects;
        widespread in north temperate zone [syn: {lychnis}]