àa — meaning in English
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English meaning
- aa noun A type of volcanic lava that cools into a rough, jagged, broken-up surface, as opposed to smooth pahoehoe lava.
Senses
àa is used for these senses in English:
- aa (volcanology) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe. [From 19th c.]