The Collaborative International Dictionary of English v.0.48:

Laker \Lak"er\, n.
   One that is connected with a lake or lakes, as in habitation,
   toil, etc.:
   (a) One of the poets of the Lake school. See Lake poets,
       under Lake, n.
   (b) (Zool.) A fish living in, or taken from, a lake, esp. the
       namaycush.
   (c) A lake steamer or canal boat.
       [1913 Webster]

             The bridge tender . . . thought the Cowies "a
             little mite" longer than that laker. --The Century.
       [Webster 1913 Suppl.]