What is the name given to the garden in a Roman house?

The correct answer is "Hortus," which refers to a garden in a Roman house. The term encompasses various types of gardens, such as those used for ornamental purposes, growing vegetables, or herbs. In Roman domestic architecture, the hortus was typically a central element, often situated in the atrium or peristyle, serving not only as a space for plants but also as a social area for relaxation and gatherings.

The distinction here is essential; while "viridarium" does refer to a green or verdant area, it is typically associated with larger, more public gardens or parks, rather than the specific gardens found in private residences. An "orchard" is specifically concerned with fruit-bearing trees rather than the broader concept of a garden. "Spatium" refers to a space, often in the context of distance or extent, which does not apply directly to gardens in the context of Roman residential structures. Understanding the nuances of these terms is crucial for grasping the architectural and social significance of gardens in ancient Rome.