megadealer means A major, large-scale dealer. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
Etymology
From mega- + dealer.
noun
- A major, large-scale dealer.“Unlike today's megadealers with their constant poachings of high-profile artists whose careers were fostered by smaller galleries — and unlike today's collectors, whose feeding frenzy is driven by fashion and an eye for the auctions — Sonnabend was a kind of incubator, said the photographer Hiroshi Sugimoto, who has shown with the gallery since the 1970s.”