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Save. sedimentary /ËsÉdÉËmÉntÉri/ adjective. sedimentary. /ËsÉdÉËmÉntÉri/. adjective. Learner's definition of SEDIMENTARY. technical. : made from material that sinks to the bottom of a liquid: made from sediment. sedimentary layers/deposits. Sandstone is a sedimentary rock. [=a type of rock formed when sediments that were deposited in ancient times were pressed together and became hard]. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. Comments & Questions. Comments & Questions.
Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known as 'clastic' sedimentary rocks); by the accumulation and the consolidation of sediments; by the deposition of the results of biogenic activity; and by precipitation from solution.