1) Associate 2) Fellow crew member 3) Nautical terminology 4) Onboard peer 5) Pulver, to Roberts 6) Starbuck, to ishmael 7) Starbuck, to Stubb 1) Crew member 
A shipmate is literally a mate on one`s own ship (i.e., a member of the same ship). In English-Speaking navies and the United States Coast Guard, the term `shipmate` is used among sailors as a generic moniker. It is used in the third person by a member of a ship`s crew to describe another member, or in the second person when referring to any o...
• (n.) One who serves on board of the same ship with another; a fellow sailor.
Ship'mate` noun One who serves on board of the same ship with another; a fellow sailor. 
[n] - an associate on the same ship with you
noun an associate on the same ship with you