Innovative; new, different; doing something that has never been done before.

plural of cracker bread

(historical) A shoe with a long, pointed toe, worn in the 12th and 13th centuries, the forerunner to the poulaine.

(organic chemistry) The sesquiterpenoid ketone 2,2,4,4-tetramethyl-6-(3-methylbutanoyl)cyclohexane-1,3,5-trione