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Definition of Pillow lava
1. Noun. Lava that hardened in rounded shapes suggestive of pillows; believed to result from underwater eruptions.
Generic synonyms: Lava
Definition of Pillow lava
1. Noun. (geology) The rock type, resembling pillows, typically formed when lava emerges from an underwater volcanic vent or a lava flow enters the ocean. ¹
¹ Source: wiktionary.com