Definitions for "Hypolimnion"
the region of a waterbody that extends from below the thermocline to the bottom of the lake; it is thus removed from much of the surface influence.
The lower layer of a lake.
The dark, cold, bottom waters of a lake that are thermally separated from the warmer (hence less dense) surface waters when a lake is stratified.
Keywords:  stratification, see
see " Stratification."