Word Study
geezer
CIDE DICTIONARY
geezer, n. [Dial. corrupt. of Guiser a mummer.].
A queer old fellow; an old chap; sometimes, an old woman. [Webster 1913 Suppl.]
OXFORD DICTIONARY
geezer, n. sl. a person, esp. an old man.
Etymology
dial. pronunc. of guiser mummer
THESAURUS
geezer
Father Time, Methuselah, Nestor, Old Paar, centenarian, dotard, elder, gaffer, golden-ager, gramps, grandfather, grandsire, graybeard, nonagenarian, octogenarian, old chap, old codger, old dog, old duffer, old geezer, old gent, old gentleman, old man, old party, old-timer, older, oldster, pantaloon, patriarch, presbyter, senior citizen, septuagenarian, sexagenarian, the quiet-voiced elders, venerable sir, veteranFor further exploring for "geezer" in Webster Dictionary Online