#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)
  supertype:  layer  a relatively thin sheetlike expanse or region lying over or under another
  subtype:  epidermis__cuticle  the outer layer of the skin covering the exterior body surface of vertebrates
     subtype:  mantle.epidermis__pallium  (zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell
  subtype:  stratum_corneum__stratumcorneum__corneum__horny_layer__hornylayer  the outermost layer of the epidermis consisting of dead cells that slough off
  subtype:  stratum_lucidum__stratumlucidum  the layer of epidermis immediately under the stratum corneum in the skin of the palms and soles
  subtype:  stratum_granulosum__stratumgranulosum  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
  subtype:  stratum_germinativum__stratumgerminativum__stratum_basale__stratumbasale__malpighian_layer__rete_Malpighii  the innermost layer of the epidermis
  subtype:  dermis__corium__derma  the deep vascular inner layer of the skin
  subtype:  cambium  the inner layer of the periosteum
  subtype:  paries__wall  (anatomy) a layer (a lining or membrane) that encloses a structure; "stomach walls"
     subtype:  abdominal_wall__abdominalwall  a wall of the abdomen
  subtype:  substratum__substrate  any stratum lying underneath another
  subtype:  horizon  a specific layer or stratum of soil or subsoil in a vertical cross section of land
     subtype:  soil_horizon  a layer in a soil profile
        subtype:  A-horizon__A_horizon  the top layer of a soil profile; usually contains humus
        subtype:  B-horizon__B_horizon  immediately below the A-horizon; contains deposits of organic matter leached from surface soils
        subtype:  C-horizon__C_horizon  beneath the B-horizon and above the bedrock; consisting of weathered rock
     subtype:  geological_horizon  a layer of rock with a particular composition (especially of fossils); for dating the stratum
  subtype:  seam.stratum__bed  a stratum of ore or coal thick enough to be mined with profit; "he worked in the coal beds"
     subtype:  coal_seam  a seam of coal
  subtype:  bed.stratum  (geology) a stratum of rock (especially sedimentary rock); "they found a bed of standstone"
     subtype:  ore_bed__orebed  a stratum of ore

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