The Collaborative International Dictionary
Comet-finder
Comet-finder \Com"et-find`er\, or Comet- seeker \Com"et- seek`er\, n. (Astron.) A telescope of low power, having a large field of view, used for finding comets.
Wiktionary
comet-finder
n. (context astronomy English) A low-powered telescope with a large field of view, used for finding comets.