• (a.) Subjected to equal pressure from every side; being in hydrostatic equilibrium, as a body submerged in a liquid at rest; pertaining to, or characterized by, isostasy.
I`so·stat'ic adjective [ Iso- + static .] (Physics & Geol.) Subjected to equal pressure from every side; being in hydrostatic equilibrium, as a body submerged in a liquid at rest; pertaining to, or characterized by, isostasy. 
isostatic Subjected to equal pressure from every side being in hydrostatic equilibrium, as a body submerged in a liquid at rest.
of, pertaining to, or characterized by isostasy.