Final answer:
The architrave is the lowermost division of a classical entablature, resting directly on the column capitals and supporting the frieze.
Step-by-step explanation:
The lowermost division of a classical entablature that rests directly on the column capitals and supports the frieze is known as the architrave. In classical architecture, the entablature is comprised of three main parts from top to bottom: the cornice, the frieze, and the architrave. The architrave is the beam or lintel that spans the space between the columns, serving as a load-bearing structure and helping to distribute the weight of the entablature above.
When examining the Doric order, a prominent classical order of architecture, we observe that it features a plain and unembellished architrave. The Doric entablature is noted for its simple design including a frieze that is composed of triglyphs and metopes. These elements, along with the fluted Doric columns with plain capitals, support the structure. It's important to differentiate the architrave from other parts of the entablature as it is distinct from the decorative frieze or the projecting cornice.