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)
layer thin structure composed of a single thickness of cells
being,
organism the state or fact of existing; "a point of view gradually coming into being"; "laws in existence for centuries"
epidermis,
cuticle the outer layer of the skin covering the exterior body surface of vertebrates
stratum lucidum the layer of epidermis immediately under the stratum corneum in the skin of the palms and soles
stratum granulosum the layer of epidermis just under the stratum corneum or (on the palms and soles) just under the stratum lucidum; contains cells (with visible granules) that die and move to the surface
paries,
wall an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure; "the south wall had a small window"; "the walls were covered with pictures"
substratum,
substrate an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population; "the Celtic languages of Britain are a substrate for English"
superstrate,
superstratum the language of a later invading people that is imposed on an indigenous population and contributes features to their language
horizon the range of interest or activity that can be anticipated; "It is beyond the horizon of present knowledge"
seam,
bed joint consisting of a line formed by joining two pieces
stratum -
people having the same social, economic, or educational status; "the working class"; "an emerging professional class"
estate of the realm,
the three estates,
estate a major social class or order of persons regarded collectively as part of the body politic of the country (especially in the United Kingdom) and formerly possessing distinct political rights
yeomanry a British volunteer cavalry force organized in 1761 for home defense later incorporated into the Territorial Army
caste in some social insects (such as ants) a physically distinct individual or group of individuals specialized to perform certain functions in the colony
caste in some social insects (such as ants) a physically distinct individual or group of individuals specialized to perform certain functions in the colony
ninja a class of 14th century Japanese who were trained in martial arts and were hired for espionage and assassinations
firing line the most advanced and responsible group in an activity; "the firing line is where the action is"
immigrant class recent immigrants who are lumped together as a class by their low socioeconomic status in spite of different cultural backgrounds
center a position on a basketball team of the player who participates in the jump that starts the game
old school a class of people favoring traditional ideas
market the world of commercial activity where goods and services are bought and sold; "without competition there would be no market"; "they were driven from the marketplace"
craft,
trade a vehicle designed for navigation in or on water or air or through outer space
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"
place an abstract mental location; "he has a special place in my thoughts"; "a place in my heart"; "a political system with no place for the less prominent groups"
stratum -
A layer of vegetation, usually of similar height.
Wikipedia
and related fields, a stratum is a layer of rock or soil with internally consistent characteristics that distinguishes it from contiguous layers. Each layer is generally one of a number of parallel layers that lie one upon another, laid down by natural forces. They may extend over hundreds of thousands of square kilometers of the Earth's surface.
