Definitionen
1.NounA noisy boaster; a swaggering fellow.
2.NounA dry, thin, crispy baked bread (usually salty or savoury, but sometimes sweet, as in the case of graham crackers and animal crackers).
3.NounA prawn cracker.
4.NounThe final section of certain whips, which is made of a short, thin piece of unravelled rope, or which is a short piece of twisted string tied to the end of the whip, which produces a distinctive cracking sound when the whip is cracked.
5.NounA firecracker.
6.NounA Christmas cracker.
7.NounA northern pintail, a dabbling duck of species Anas acuta.
8.NounA person or thing that breaks a thing (e.g., nutcracker)."a lobster and crab shell cracker"
9.NounRefinery equipment used to pyrolyse organic feedstocks. If catalyst is used to aid pyrolysis it is informally called a cat-cracker
10.NounA pair of fluted rolls for grinding caoutchouc.
11.NounOne who cracks (i.e. overcomes) computer software or security restrictions.
12.NounA fine, great thing or person (crackerjack)."She's an absolute cracker!; The show was a cracker!; A cracker of a day."
13.Noun(Discuss this sense) An ambitious or hard-working person (i.e. someone who arises at the 'crack' of dawn).
14.NounAn impoverished white person from the southeastern United States, originally associated with Georgia and parts of Florida; any white person (slang).