  Andreev reflection spectroscopy of ferromagnet/superconductor (FS) junctions
is an important probe of spin polarization. We theoretically investigate
spin-polarized transport in FS junctions in the presence of Rashba and
Dresselhaus interfacial spin-orbit fields and show that Andreev reflection can
be controlled by changing the magnetization orientation. We predict a giant in-
and out-of-plane magnetoanisotropy of the junction conductance. If the
ferromagnet is highly spin polarized---in the half-metal limit---the
magnetoanisotropic Andreev reflection depends universally on the spin-orbit
fields only. Our results show that Andreev reflection spectroscopy can be used
for sensitive probing of interfacial spin-orbit fields in FS junction.
