solifluction
Concise Oxford English Dictionary © 2008 Oxford University Press:
solifluction /ˌsɒlɪˈflʌkʃ(ə)n, ˌsəʊlɪ-/
▶noun Geology the gradual movement of wet soil down a slope.
– origin early 20th cent.: from L. solum ‘soil’ + fluctio(n-) ‘flowing’, from fluere ‘to flow’.
'solifluction' also found in these Oxford entries:

