Source : Webster's Revised Unabridged Dictionary (1913)

Adonis \A*do"nis\ ([.a]*d[=o]"n[i^]s), n. [L., gr. Gr.
   'A`dwnis.]
   1. (Gr. Myth.) A youth beloved by Venus for his beauty. He
      was killed in the chase by a wild boar.

   2. A pre["e]minently beautiful young man; a dandy.

   3. (Bot.) A genus of plants of the family {Ranunculace[ae]},
      containing the pheasant's eye ({Adonis autumnalis}); --
      named from Adonis, whose blood was fabled to have stained
      the flower.

Source : WordNet®

adonis
     n 1: any handsome young man
     2: annual or perennial herbs [syn: {genus Adonis}]
     3: (Greek mythology) a handsome youth loved by Aphrodite, the
        goddess of love