From Longman Dictionary of Contemporary Englishflatbedflat‧bed /ˈflætbed/ adjective [only before noun] having a flat surface to put something on a flatbed scanner a flatbed truck —flatbed noun [countable]
Examples from the Corpus
flatbed• Somewhat surprisingly one of the cheapest scanners, the Thunderscan, can outperform most of the expensive flatbed machines in this respect.• Cheaper flatbed plotters, capable of plotting on sheets of A4 or A3 size paper, can be interfaced to personal computers.• They came with two flatbed trucks and they emptied the apartment.• Several at the scene said low flatbed trucks had been stuck at the crossing in the past. 