The Collaborative International Dictionary of English v.0.48:

Narcissus \Nar*cis"sus\ (n[aum]r*s[i^]s"s[u^]s), n.; pl.
   Narcissuses. [L. narcissus, and (personified) Narcissus,
   Gr. na`rkissos, Na`rkissos, fr. na`rkh torpor, in allusion to
   the narcotic properties of the flower. Cf. Narcotic.]
   [1913 Webster]
   1. (Bot.) A genus of endogenous bulbous plants with handsome
      flowers, having a cup-shaped crown within the six-lobed
      perianth, and comprising the daffodils and jonquils of
      several kinds.
      [1913 Webster]

   2. (Classical Myth.) (Capitalized)A beautiful youth fabled to
      have been enamored of his own image as seen in a fountain,
      and to have been changed into the flower called Narcissus.
      [1913 Webster]

WordNet (r) 3.0 (2006):

narcissus
    n 1: bulbous plant having erect linear leaves and showy yellow
         or white flowers either solitary or in clusters
    2: (Greek mythology) a beautiful young man who fell in love with
       his own reflection

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "Narcissus":
   Adonis, Aphrodite, Apollo, Apollo Belvedere, Astarte, Balder,
   Cleopatra, Freya, Hebe, Hyperion, Venus, Venus de Milo, braggart,
   egocentric, egoist, egotist, houri, individualist, know-it-all,
   narcissist, narcist, no modest violet, peri, smart aleck,
   swellhead, the Graces



Easton's 1897 Bible Dictionary:

Narcissus
   daffodil, a Roman whom Paul salutes (Rom. 16:11). He is supposed
   to have been the private secretary of the emperor Claudius. This
   is, however, quite uncertain.


Hitchcock's Bible Names Dictionary (late 1800's):

Narcissus, astonishment; stupidity