Longman Dictionary of Contemporary English homepage

Topic: GEOLOGY

Date: 1500-1600
Language: Modern Latin
Origin: Latin, 'something spread, bed', from sternere 'to spread out'

stratum

noun
     
stra‧tum plural strata [countable]
1HEG a layer of rock or earth
2SS a social class in a society:
people of different social strata
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