A flat, broad vessel on which dishes, glasses, etc., are carried; a waiter; a salver.
flat, perforated "shelves" at prescribed levels in a distillation tower, which allow specific vaporized crude oil components to pass through and then condense on their surfaces (after contacting domes called "bubble caps" above the perforations) before being drawn off for further distillation.
A container used in postal facilities to hold letters and First-Class Mail flats. It is used as a basic unit of mail quantity for purposes of preparing mail to qualify for discounted postage rates. Also see full flat tray, full letter tray, less-than-full tray, and overflow tray.