The Collaborative International Dictionary
Candlebomb
Candlebomb \Can"dle*bomb`\, n.
A small glass bubble, filled with water, which, if placed in the flame of a candle, bursts by expansion of steam.
A pasteboard shell used in signaling. It is filled with a composition which makes a brilliant light when it explodes.
--Farrow.
Wiktionary
candlebomb
n. 1 A small glass bubble, filled with water, which, if placed in the flame of a candle, bursts by expansion of steam. 2 A pasteboard shell used in signaling, filled with a substance which makes a brilliant light when it explodes.