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n. A back door; a postern.

n. The term used by Vitruvius, and adopted from him in English, for the open vestibule of an ancient temple in the rear of the cella, corresponding to the pronaos at the front of the temple.

n. Eccles., a reredos.

n. [pl. postica (-kä).] In Rauff's terminology of sponge morphology, the cloacal openings of the exhalant canals or aporrhysa.

"On the right hand of the peristyle, near the entrance, is a private door, or _posticum_, leading into the Street of the Theatres, by which the master of the house might escape his importunate clients."