Definition of aquitard
plural aquitards
geology
: a geologic formation or stratum that lies adjacent to an aquifer and that allows only a small amount of liquid to pass
- If the water level—and thus the pressure—drops enough, water is slowly squeezed out of the large clayey layers—called aquitards—that more or less seal the aquifer, and an aquifer's compression becomes irreversible.
- —Peter Bacque, Richmond (Virginia) Times Dispatch, 14 Nov. 2002
