teatrem
Teatrem is not a standard form in classical Latin for the word meaning “theatre.” While the Latin noun for a theater is theatrum, the accusative singular is also theatrum, and the neuter plural is theatra. The form teatrem is generally regarded as a nonstandard or erroneous variant rather than a correct Latin inflection. In discussions of Latin, teatrem is sometimes mentioned as a hypothetical or mistaken form, but it does not appear in classical texts as a correctly declined form of theatrum.
Theatrum, from which teatrem would derive in some nonstandard treatments, comes from the Greek theatron, meaning
In modern languages, the root of the Latin theatrum survives in words such as Italian teatro, French
See also: theatrum, theatron, theatre (and related terms in Romance languages).