Source : Webster's Revised Unabridged Dictionary (1913)

Rub \Rub\, n.

   {Rub of the green} (Golf), anything happening to a ball in
      motion, such as its being deflected or stopped by any
      agency outside the match, or by the fore caddie. Rubaiyat
\Ru*bai*yat"\, n. pl.; sing. {Rubai}. [Ar. rub[=a]'iy[=a]h
   quatrian, pl. of rub[=a]'iy having four radicals, fr.
   rub[=a]' four.]
   Quatrians; as, the Rubaiyat of Omar Khayyam. Sometimes in pl.
   construed as sing., a poem in such stanzas.