pycnocline

About 0.04 uses per million words.

Meaning

1. noun A boundary layer in a body of water between areas of different temperature or salinity.

   The bay has fresher water at the surface and saltier water at the bottom, in between is the pycnocline.

2. noun A layer of water where the density changes rapidly with depth

Similar words

thermocline isopycnal metalimnion hypolimnion isopycnic shoreline isothermobath littoral ionopause isobathytherm

Often followed by

is and in at depth was layer to zone