Wiktionary
n. An open receptacle lined with a layer of absorbent material for use as a toilet by a cat or similar animal when indoors.
Usage examples of "litter tray".
Through in the kitchen, he could see Scarlatti scraping his litter tray and, reminded of Aunt Dinah, nearly blacked out.
Sooner or later it's going to demand a litter tray and start throwing up on the carpet.
It had crouched in corners, snarling and hissing at him, slinking around the scant furniture, skulking beneath the bunkbed, never using the plastic litter tray that Maurice had so thoughtfully provided, as though it might be trapped in that particular corner and bludgeoned to death.
If she could get it into her room for a few days without anyone noticing, give it a litter tray and some food, then they wouldn't have the heart to turn it out.