[1] : The Collaborative International Dictionary of English v.0.48

looker \look"er\, n.
   1. one who looks.
      1913 webster

   2. a person who is physically very attractive, especially a
      beautiful woman.
      pjc

   looker-on, a spectator; an onlooker; one that looks on, but
      has no agency or part in an affair.
      1913 webster

            did not this fatal war affront thy coast,
            yet sattest thou an idle looker-on ?  --fairfax.
      1913 webster
see also:
looker-on 

[2] : WordNet (r) 2.0

looker
     n 1: a close observer; someone who looks at something such as an
          exhibition of some kind; "the spectators applauded the
          performance"; "television viewers"; "sky watchers
          discovered a new star" syn: spectator, witness, viewer,
           watcher
     2: a very attractive or seductive looking woman syn: smasher,
         stunner, knockout, beauty, ravisher, sweetheart,
         peach, lulu, mantrap, dish
see also:
spectator witness viewer watcher smasher stunner 
knockout beauty ravisher sweetheart peach 
lulu mantrap dish 

[3] : Moby Thesaurus II by Grady Ward, 1.0

76 moby thesaurus words for "looker":
   miss america, tv-viewer, accepter, acquirer, addressee, audience,
   auditor, bathing beauty, beau ideal, beaut, beauty,
   beauty contest winner, beauty queen, beholder, belle, bird-watcher,
   bunny, bystander, charmer, consignee, cover girl, dazzler, dream,
   drugstore cowboy, enchantress, eyeful, eyewitness, gaper, gazer,
   gazer-on, getter, girl-watcher, goggler, great beauty, hearer,
   holder, kibitzer, knockout, lady fair, listener, looker-on, lovely,
   model, observer, obtainer, ogler, onlooker, paragon, payee, peach,
   perceiver, percipient, pinup, pinup girl, procurer, pussycat,
   raving beauty, receiver, recipient, reigning beauty, seer,
   sex kitten, sidewalk superintendent, slick chick, spectator,
   spectatress, spectatrix, stunner, taker, televiewer,
   television-viewer, trustee, video-gazer, viewer, watcher,
   witness

Looker >> L Words
Looker, definition of term: Looker
looker_pag1.html