资料来源 : Webster's Revised Unabridged Dictionary (1913)

Pahoehoe \Pa*ho"e*ho`e\, n. (Min.)
   A name given in the Sandwich Islands to lava having a
   relatively smooth surface, in distinction from the
   rough-surfaced lava, called a-a.

资料来源 : WordNet®

pahoehoe
     n : freely flowing lava