WordNet (r) 3.0 (2006):

old man
    n 1: a man who is very old [syn: old man, greybeard,
         graybeard, Methuselah]
    2: a familiar term of address for a man [syn: old boy, old
       man]
    3: an informal term for your father
    4: aromatic herb of temperate Eurasia and North Africa having a
       bitter taste used in making the liqueur absinthe [syn:
       common wormwood, absinthe, old man, lad's love,
       Artemisia absinthium]
    5: (slang) boss