  In this paper, we obtain the dispersion relation for the lower-hybrid
oscillations/waves in a cold magnetized electron-positron-ion (e-p-i) plasma.
It is found that the frequency of the lower-hybrid oscillations in an e-p-i
plasma is approximate $1/\sqrt{3}$ times the frequency of lower-hybrid
oscillations in an electron-ion (e-i) plasma, provided the plasma density is
high, and the equilibrium densities of the positron and the ion are balanced.
The present work may have some relevance for laboratory/astrophysical e-p-i
plasmas.
