The Collaborative International Dictionary
On-looker
On-looker \On"-look`er\, n. A person who observes an event; a looker-on; a spectator.
Douglas Harper's Etymology Dictionary
Wiktionary
on-looker
n. (alternative spelling of onlooker English)
Usage examples of "on-looker".
Then, to the amazement of the two on-lookers, he set the four axolotls on the plate, and they immediately began to dance about as if they were having a wonderful time of it They dashed this way and darted that way and made little axolotl footprints throughout, pausing now and again to lick their feet clean before prancing off again through the goop.
Much to the astonishment of most of the on-lookers hed refused the night before to join the congratulatory toast to Thomas as James broke out a fresh bottle of brandy.