a flat metal pan used for baking cookies, bread, etc.
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baking sheet UK [ˈbeɪkɪŋ ˌʃiːt] US [ˈbeɪkɪŋ ˌʃit] noun [countable] [singular baking sheet plural baking sheets]
a baking tray
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noun, pl ⋯ sheets [count]
: a flat piece of metal used for baking things (such as cookies and biscuits) in an oven — called also (chiefly US) cookie sheet
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a small sheet of metal used for baking food on
Useful english dictionary. 2012.