noun \ˈsiŋk-ˌhōl\

: a low area or hole in the ground that is formed especially when soil and rocks are removed by flowing water

Full Definition of SINKHOLE

:  a hollow place or depression in which drainage collects
:  a hollow in a limestone region that communicates with a cavern or passage
:  sink 2
:  something (as an unprofitable investment) that steadily drains money or resources <a financial sinkhole>

First Known Use of SINKHOLE

15th century

Other Geology Terms

anthracite, boulder, cwm, erratic, igneous, intrusive, mesa, sedimentary, silt, swale


noun    (Concise Encyclopedia)

Depression formed as underlying limestone bedrock is dissolved by groundwater. Sinkholes vary greatly in area and depth and may be very large. The two main varieties are those caused by the collapse of a cavern roof, and those caused by the gradual dissolving of rock under a soil mantle. Collapsed sinkholes generally have steep rock sides and may receive streams that then flow underground. Soil-mantled sinkholes are generally shallower; they may become clogged with clay and hold a small lake.

Variants of SINKHOLE

sinkhole or sink or doline


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