beachmaster noun3 •An officer who supervises soldiers' disembarkation.Lieutenant Rhodes, Washington, take charge transportation of Landing Force to beach ; assume duties of Beachmaster ; return boats, less armed launches, to ship when landing is completed. — 1879 •In pinnipeds, the dominant male of a territory with whom the females exclusively mate. •The caretaker of a beach.Meantime the beachmaster had his boys at work on the “gréve” or pebbly beach which had to be kept thoroughly clean and free from grass and seaweed. — 1949 formsbeachmasters