comparator

 
Pronunciation: /kəmˈparətə/

noun

  • a device for comparing something measurable with a reference or standard.
  • an electronic circuit for comparing two electrical signals.
  • something used as a standard for comparison: even taking the most favourable comparator the company is about 20 per cent higher

Origin:

late 19th century: from Latin comparat- 'paired, matched', from the verb comparare (see compare), + -or1