portside noun 2adjective 1adverb 1forms 3 noun2 •The port (left) side of a boat. •An area alongside a port. adjective1 •On the port (left) side of a ship.All was quiet for several minutes until the fog broke and a large oak tree passed outside my portside window. — 2007 adverb1 •Toward or on the port side.Ship was to dock portside to at pier 1 but ended up starboardside as docking became seriously complicated — 1959 formsportsides · more portside · most portside