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plural pahoehoes
A form of lava flow of basaltic rock, usually dark-colored with a smooth or ropey surface. It is one of two chief forms of lava flow emitted from volcanoes of the Hawaiian type, the other form being aa. quotations examples
We [...] saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers.
1859, R. C. Haskell, American journal of science and arts, series XXVIII
The twisty, ropy kind that personifies flow – all congealed motion – is called pahoehoe.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 44