Stratum

/stɹˈɑːtəm/

/ˈstɹætəm/

Stratum

one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)

an abstract place usually conceived as having depth

synonyms : layer

level

a subpopulation divided into a stratified sampling

a group of people with similar social standing, education, or income

synonyms : class

social class

socio-economic class

a distinct layer or level within a language system, such as different dialects, sociolects, or registers, that are associated with specific social groups, regions, or levels of formality

Examples

1. The topmost layer is the stratum corneum.

2. Each colorful stratum in the 150 feet of sediment tells an ancient tale from a hundred million years ago.

3. They diffuse into the stratum corneum.

4. The next layer up is the stratum granulosum which is 3 to 5 cell layers thick.