Source : Webster's Revised Unabridged Dictionary (1913)

Landlubber \Land"lub`ber\, n. [Prop. fr. land + lubber, or
   possibly corrupted fr. laudlouper.] (Naut.)
   One who passes his life on land; -- so called among seamen in
   contempt or ridicule.

Source : WordNet®

landlubber
     n 1: a person who lives and works on land [syn: {landsman}, {landman}]
     2: an inexperienced sailor; a sailor on the first voyage [syn:
        {lubber}, {landsman}]