Definitions from Wiktionary ( )

▸ noun:  A dry, thin, crispy baked bread (usually salty or savoury, but sometimes sweet, as in the case of graham crackers and animal crackers).
▸ noun:  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.
▸ noun:  A firecracker.
▸ noun:  A person or thing that cracks, or that cracks a thing (e.g. whip cracker; nutcracker).
▸ noun:  The final section of certain whips, which is made of a short, thin piece of unravelled rope and produces a cracking sound.
▸ noun:  A Christmas cracker.
▸ noun:  Refinery equipment used to pyrolyse organic feedstocks. If catalyst is used to aid pyrolysis it is informally called a cat-cracker
▸ noun:  (slang, chiefly British, Ireland, Australia, New Zealand) A fine, great thing or person (crackerjack).
▸ noun:  An ambitious or hard-working person (i.e. someone who arises at the 'crack' of dawn).
▸ noun:  (computing) One who cracks (i.e. overcomes) computer software or security restrictions.
▸ noun:  (obsolete) A noisy boaster; a swaggering fellow.
▸ noun:  (US, derogatory, ethnic slur, offensive) An impoverished white person from the southeastern United States, originally associated with Georgia and parts of Florida; (by extension) any white person (slang).
▸ noun:  (Florida, slang, derogatory) A police officer.
▸ noun:  A northern pintail, species of dabbling duck.
▸ noun:  (obsolete) A pair of fluted rolls for grinding caoutchouc.

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