
• (n.) A small glass bubble, filled with water, which, if placed in the flame of a candle, bursts by expansion of steam. • (n.) A pasteboard shell used in signaling. It is filled with a composition which makes a brilliant light when it explodes.
Found on 
http://thinkexist.com/dictionary/meaning/candlebomb/
 Can'dle·bomb`  noun   1.
Can'dle·bomb`  noun   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. It is filled with a composition which makes a brilliant light when it explodes. 
 Farrow. Found on 
http://www.encyclo.co.uk/webster/C/15
  No exact match found.