The Collaborative International Dictionary of English v.0.48:

Seer \Seer\ (s[=e]r), a.
   Sore; painful. [Prov. Eng.] --Ray.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Seer \Se"er\ (s[=e]"[~e]r), n.
   One who sees. --Addison.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Seer \Seer\ (s[=e]r), n. [From See.]
   A person who foresees events; a prophet. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

seer
    n 1: a person with unusual powers of foresight [syn:
         visionary, illusionist, seer]
    2: an observer who perceives visually; "an incurable seer of
       movies"
    3: an authoritative person who divines the future [syn:
       prophet, prophesier, oracle, seer, vaticinator]