stratum

nouns

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)

stratum

is derived from

stratify

is derived from

stratify

domain category

a living thing that has (or can develop) the ability to act or function independently

being, organism

is a type of (narrower)

a relatively thin sheetlike expanse or region lying over or under another

layer

people having the same social, economic, or educational status

"the working class"; "an emerging professional class"

class, social class, socio-economic class, stratum

an abstract place usually conceived as having depth

"a good actor communicates on several levels"; "a simile has at least two layers of meaning"; "the mind functions on many strata simultaneously"

layer, level, stratum