aa

1. noun /ˈɑːɑː/

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.

We...saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers.

2. verb /ˈɑːɑː/

come