1. the water beneath the surface of the ground, consisting largely of surface water that has seeped down: the source of water in springs and wells.


  1. underground water that has come mainly from the seepage of surface water and is held in pervious rocks

“water in the ground,” also ground water, 1890, from ground (n.) + water (n.). Attested from mid-15c. in sense “water at the bottom of a stream.”

  1. Water that collects or flows beneath the Earth’s surface, filling the porous spaces in soil, sediment, and rocks. Groundwater originates from rain and from melting snow and ice and is the source of water for aquifers, springs, and wells. The upper surface of groundwater is the water table.

Water that seeps through the soil or rocks underground.

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