Definition of pair royal in US English:

pair royal

noun

  • A set of three playing cards of the same denomination. "double pair-royal"noun a set of four such cards.

Origin

Late 16th century (in an earlier sense). From pair + royal. The semantic motivation for the compound is unclear; there do not appear to be models or parallels in other languages, and the postposed adjective does not seem to reflect any similar compound in French. In later use chiefly in form prial.

Pronunciation

pair royal

/ˌpɛːˈrɔɪəl/