Etymology
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tray (n.)

Old English treg, trig "flat wooden board with a low rim," from Proto-Germanic *traujam (source also of Old Swedish tro, a corn measure), from PIE *drou-, variant of root *deru- "be firm, solid, steadfast," with specialized senses "wood, tree" and derivatives referring to objects made of wood. The primary sense may have been "wooden vessel."

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Definitions of tray

tray (n.)
an open receptacle for holding or displaying or serving articles or food;
From wordnet.princeton.edu