What is the description for a colony morphology that is dense and opaque with a smooth edge?

The description of a colony morphology that is dense and opaque with a smooth edge is accurately represented by the term "convex." Colonies that are described as convex typically have a raised, rounded appearance and can often appear smoother at the edges. The density and opacity indicate that the colonies are well-developed and may be composed of a large number of cells, contributing to the overall appearance.

In contrast, the other terms refer to different characteristics. "Filiform" usually describes a growth pattern that is thin and thread-like, often seen in certain bacterial cultures. "Friable" indicates a texture that crumbles easily, which does not align with the described smooth, dense characteristics. "Opaque" refers to the lack of transparency, which is a trait of the colony but does not specifically address the shape or edge smoothness central to the question. Thus, "convex" best encapsulates the overall appearance of the colony morphology based on the given characteristics.