tray S3 /treɪ/ BrE AmE noun [countable]
[ Language: Old English ; Origin: trig , treg ]
1 . a flat piece of plastic, metal, or wood, with raised edges, used for carrying things such as plates, food etc:
The waiter brought drinks on a tray.
2 . a flat open container with three sides used for holding papers, documents etc on a desk
in tray (=for holding documents you still have to deal with)
out tray (=for holding documents you have dealt with)
3 . especially British English a flat open container with four sides used for holding certain things:
a cat litter tray
seed tray (=a tray in which you plant seeds)
⇨ ↑ baking tray , ↑ system tray