We study in this Note scalar fully nonlinear stochastic second order partia
l differential equations, possibly, degenerate with a semilinear stochastic
dependence. We introduce a notion of stochastic viscosity solutions adapte
d to that class of equations. And we show general existence, uniqueness and
regularity results. (C) 2000 Academie des sciences/Editions scientifiques
et medicales Elsevier SAS.