lava in the form of an agglomeration of rounded, pillow-shaped masses, the result of subaqueous or subglacial volcanic eruption.
lava that has solidified under water, having a characteristic structure comprising a series of close-fitting pillow-shaped masses
Lava that forms from an underwater eruption and is characterized by pillow-shaped masses. Pillow lava forms when hot lava is suddenly exposed to cold water, forming a sacklike membrane that is filled with additional cooling and solidifying lava. The outer membrane is usually finer grained than the inner lava.
noun 1. an ornamental cover laid over a bed pillow. noun 1. (mainly US) a decorative cover for a bed pillow
noun 1. a straight sword of the 17th century.
- Pillow splint
pillow splint pil·low splint (pĭl’ō) n. A splint that is inflatable or that is made from unusually bulky fabric.
[pil-oh-ee] /ˈpɪl oʊ i/ adjective 1. pillowlike; soft; yielding: a pillowy carpet.