isopycnic
I`so*pyc"nic, a. Etym: [Iso- + Gr. pykno`s dense.] (Physics) Defn: Having equal density, as different regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface. I`so*pyc"nic, n. (Physics) Defn: A line or surface passing through those points in a medium, at which the density is the same.