Aciculiform is an adjective that refers to something shaped like a needle, spine or a similar sharp object. Some synonyms that can be used for aciculiform include needle-shaped, pointed, spiky, tapered, sharp, slender, thin and slender. These synonyms are useful when describing an object that has a slim, elongated shape with a sharp point. They can be used in various contexts, such as scientific or botanical descriptions of plants or animals, or in everyday language to describe objects like icicles, stalactites, or thorns. It's important to choose the right synonym based on the context in which it is being used to ensure that the intended meaning is conveyed accurately.