This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An old man.

n. Metaphorically, any of the members of a group who have been there the longest (regardless of actual age or gender.)

n. a man who is old.

n. a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century)

n. a man who is very old

"Jack Straw - Mr Brown's loyal "greybeard" - will stay as Justice Secretary."

jug   

old man   

war-chariot    brach    black-garbed    woman-servant    sheiks    case!    schoolfellow    nightscape    victualler    barefoot