vesicular

This term is primarily used in medical and geological contexts to describe a specific type of structural void. In dermatology, it describes a surface eruption where tiny, clear bubbles of serum trap themselves under the skin, creating a distinct tactile and visual profile of tension and transparency. In volcanology, it describes the porous texture of igneous rocks where gas bubbles were trapped during the cooling process. The feeling is one of honeycombed fragility or a sponge-like density, contrasting with dense, non-vesicular rock.