Meaning

• A dry, thin, crispy baked bread (usually salty or savoury, but sometimes sweet, as in the case of graham crackers and animal crackers).

• A short piece of twisted string tied to the end of a whip that creates the distinctive sound when the whip is thrown or cracked.

• A firecracker.

• A person or thing that cracks, or that cracks a thing (e.g. whip cracker; nutcracker).

• A Christmas cracker.

• Refinery equipment used to pyrolyse organic feedstocks. If catalyst is used to aid pyrolysis it is informally called a cat-cracker

• A fine thing or person (crackerjack).

  "She's an absolute cracker!"

• An ambitious or hard-working person (i.e. someone who arises at the 'crack' of dawn).

• One who cracks (i.e. overcomes) computer software or security restrictions.

• A noisy boaster; a swaggering fellow.

• (racial slur) An impoverished white person from the southeastern United States, originally associated with Georgia and parts of Florida; (by extension) any white person.

• (Florida) A police officer.

• A northern pintail, species of dabbling duck.

• A pair of fluted rolls for grinding caoutchouc.