The Collaborative International Dictionary of English v.0.48:

Attractor \At*tract"or\ ([a^]t*tr[a^]kt"[~e]r), n.
   One who, or that which, attracts. --Sir T. Browne
   [1913 Webster]

WordNet (r) 3.0 (2006):

attractor
    n 1: an entertainer who attracts large audiences; "he was the
         biggest drawing card they had" [syn: drawing card,
         draw, attraction, attractor, attracter]
    2: (physics) a point in the ideal multidimensional phase space
       that is used to describe a system toward which the system
       tends to evolve regardless of the starting conditions of the
       system [syn: attractor, attracter]
    3: a characteristic that provides pleasure and attracts;
       "flowers are an attractor for bees" [syn: attraction,
       attractor, attracter, attractive feature, magnet]