messmate

From mess +‎ mate.

messmate (plural messmates)

1. (nautical) An associate with whom one shares a mess (eating place) on a ship.
   • 1879, W[illiam] S[chwenck] Gilbert, Arthur Sullivan, composer, H.M.S. Pinafore;  […], San Francisco: Bacon & Company,  […], →OCLC:

     Messmates, ahoy! Come here! Come here!

   • 1881–1882, Robert Louis Stevenson, Treasure Island, London; Paris: Cassell & Company, published 14 November 1883, →OCLC:

     The cap’n was displeased at that, but my messmates were all of a mind and landed.

2. (Australia) Any of various eucalypts with rough bark, specifically Eucalyptus obliqua.