  We examine the contributions of Majorana neutrinos to CP-violating WWZ and
ZZZ self-couplings, using a model in which sterile neutrinos couple to the W
and Z by mixing with a fourth-generation heavy lepton. We find that the induced
form factors can be as large as 0.5%. The model satisfies all phenomenological
bounds in a natural way, including those due to the strong limits on the
neutron and electron electric dipole moments. Anomalous CP-odd couplings of
this size are unlikely to be observed at LEP200, but might be detectable at
NLC.
