Oblong is a general but useful term for describing the shape of things such as leaves. There's no such thing as an oblong circle, since a stretched circle has to be called an oval, and any rectangle that isn't square is oblong, at least if it's lying on its side (such rectangles can actually be called oblongs). Pills are generally oblong rather than round, to slide down the throat more easily. An oblong table will often fit a living space better than a square or round one with the same area. And people are always buried in oblong boxes.