Source : Webster's Revised Unabridged Dictionary (1913)

Graybeard \Gray"beard`\, n.
   An old man. --Shak.

Source : WordNet®

graybeard
     n 1: a man who is very old [syn: {old man}, {greybeard}, {Methuselah}]
     2: a stoneware drinking jug with a long neck; decorated with a
        caricature of Cardinal Bellarmine (17th century) [syn: {bellarmine},
         {longbeard}, {long-beard}]