A bobèche is a cup or ring at the top of a
candlestick
A candlestick is a device used to hold a candle in place. Candlesticks have a cup or a spike ("pricket") or both to keep the candle in place. Candlesticks are less frequently called "candleholders".
Before the proliferation of electricity, candl ...
, used to catch melted wax running down the side of the candle. Usually made of glass, but often seen made of paper as well.
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Candles