1.Definition: (technology) a process that acts to absorb or remove energy or a substance from a system

"The ocean is a sink for carbon dioxide"

Category: General

2.Definition: a covered cistern; waste water and sewage flow into it

Related Noun(s):cesspit, cesspool, sump

Category: Objects

3.Definition: a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof

Related Noun(s):sinkhole

Category: Objects

4.Definition: plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe

Category: Objects