The date before which a document must have been written. / The date before which an archaeological artifact must have been deposited.

craniocerebellocardiac dysplasia: a rare condition whose symptoms include heart defects, cerebellar hypoplasia, and cranial dysmorphism.

Involving trickery or deception. / Able to perform tricks. / Defective or unreliable. / (chiefly US, slang) Stylish or cool.

Said after tricking someone into believing there was something to be seen where, in fact, there was not.