boatside adjective 1adverb 1noun 1forms 3 adjective1 •Near or for boats.While in an airport waiting for a flight, he read an article about a new firm named Boatside Services that was offering boatside fueling, polishing, oil changes and head pump-outs. — 1999 adverb1 •Beside a boat.When he of the men hooked a cobia, the level of their voices picked up and soon—too soon—they had it boatside. — 1983 noun1 •The side of a boat.At that same moment Gregson, excited too, flattened him against the boatside so that he could not move. — 1947 formsboatsides · more boatside · most boatside