/uy sos"teuh see/ , n.
1. Geol. the equilibrium of the earth's crust, a condition in which the forces tending to elevate balance those tending to depress.
2. the state in which pressures from every side are equal.
Also, isostacy .
[ 1885-90; ISO- + -stasy -stasia; see STASIS, -Y 3 ]