Intermewed describes a medieval practice that is currently viewed as:

Intermewed refers to a historical practice where birds of prey were kept in a mew, or a type of aviary, during specific periods to help them regain strength and prepare for hunting or to rest after a season of hunting. This practice is rooted in medieval falconry traditions and has become somewhat outdated as modern falconry focuses on different methodologies and techniques more suited to contemporary practices and regulations.

Given the context, classifying intermewed as an archaic practice accurately reflects its place in the evolution of falconry. It emphasizes how methods have transformed over time as better understanding and technologies have emerged in the handling and training of falconry birds. While other choices may refer to techniques or methods that are still in practice, the term "archaic" effectively encapsulates the notion that intermewed is largely historic and not commonly applied in current falconry, which relies on more advanced approaches to bird care and training.