/
ˈnɑːsɪsɪz(ə)m, 
nɑːˈsɪs-/
n.
 excessive or erotic interest in oneself and one's appearance.
Derivative
- narcissist n.
  - narcissistic adj.
  - narcissistically adv.
 
Etymology
C19: from Narcissus, the name of a beautiful youth in Greek mythology who fell in love with his own reflection in a pool, + -ism.