Definition
Biserrate describes a margin or edge that is doubly serrated, meaning it has smaller teeth-like serrations on larger serrations. Imagine a saw blade where each tooth itself has smaller teeth along its edges. It's like a complex, layered pattern of teeth. Think of it as a more intricate version of a simple serrated edge. The term often refers to leaves, but it can describe any edge with this double-toothed pattern. In summary, 'biserrate' indicates a detailed and finely jagged edge.