The term 'alae' refers to what feature within a Roman atrium?

The term 'alae' in the context of a Roman atrium refers to the side alcoves or wings that are typically located on either side of the central space of the atrium. These areas were often used for various purposes, such as storage or as spaces for displaying art, and they added to the overall architectural design of the Roman house. The presence of these side alcoves allowed for a more functional use of space within the home, contributing to both aesthetic and practical elements of Roman domestic architecture.

In contrast, the other options describe different features that do not align with the specific meaning of 'alae'. The dining area pertains to the triclinium, the study space could refer to a tablinum or cubiculum, and the entranceway relates to the vestibulum or fauces. Thus, 'alae' specifically denotes the side alcoves distinct from these other functional areas.