Foraminous is a term used to describe something that is full of small openings or pores. Synonyms for "foraminous" include porous, holey, perforated, pitted, lacunose, fenestrated, sieve-like, and cribriform. All of these words indicate that there are small spaces or holes in an object or material, whether it's a sponge or rock. "Porosity" is often used to describe the degree to which something is foraminous. These words can be used to describe natural objects like limestone or artificial materials like concrete. Regardless of the context, these synonyms all characterize an object as being permeable or having many openings for air, water, or substances to pass through.