Learn how to say Stratum correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word stratum:
noun (plural strata /-tə/)
1a layer or a series of layers of rock in the ground:
a stratum of flint
a thin layer within any structure:
thin strata of air
2a level or class to which people are assigned according to their social status, education, or income:
members of other social strata
Statistics a group into which members of a population are divided in stratified sampling:
allocation of sample units to strata
late 16th century (in the sense ‘layer or coat of a substance’): modern Latin, from Latin, literally ‘something spread or laid down’, neuter past participle of sternere ‘strew’
In Latin the word stratum is singular and its plural form is strata. In English this distinction is maintained—it is incorrect to use strata as a singular or to create the form stratas as the plural: a series of overlying strata not a series of overlying stratas, and a new stratum was uncovered not a new strata was uncovered.