\I`so*pyc"nic\, a. [Iso- + Gr. pykno`s dense.]
(Physics)
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)
A line or surface passing through those points in a medium,
at which the density is the same.