|a volcanic rock consisting of angular blocks of lava with a very rough surface|
|4.||(in Britain) Automobile Association|
|5.||(in Britain) Advertising Association|
|6.||(in Britain, formerly) a film that may not be shown publicly to a child under fourteen|
A type of lava having a rough, jagged surface. It is relatively slow moving in its molten state, advancing in the form of massive blocks with fissured and angular surfaces that ride on a viscous interior. The blocks range in size between the size of a football and the size of a house. See Note at pahoehoe.