Etymology
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Words related to stratum

*stere- 
*sterə-, also *ster-, Proto-Indo-European root meaning "to spread."

It forms all or part of: consternate; consternation; construct; construction; destroy; destruction; industry; instruct; instruction; instrument; obstruct; obstruction; perestroika; prostrate; sternum; sternocleidomastoid; strain (n.2) "race, stock, line;" stratagem; strategy; strath; strato-; stratocracy; stratography; stratosphere; stratum; stratus; straw; stray; street; strew; stroma; structure; substrate; substratum; substructure.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit strnoti "strews, throws down;" Avestan star- "to spread out, stretch out;" Greek stronymi "strew," stroma "bedding, mattress," sternon "breast, breastbone;" Latin sternere "to stretch, extend;" Old Church Slavonic stira, streti "spread," strana "area, region, country;" Russian stroji "order;" Gothic straujan, Old High German strouwen, Old English streowian "to sprinkle, strew;" Old English streon "strain," streaw "straw, that which is scattered;" Old High German stirna "forehead," strala "arrow, lightning bolt;" Old Irish fo-sernaim "spread out," srath "a wide river valley;" Welsh srat "plain."
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strata (n.)
c. 1700, plural of stratum.
stratification (n.)
1610s, from Medieval Latin stratificationem (nominative stratificatio), noun of action from past participle stem of stratificare "to form strata," from stratum "thing spread out" (see stratum) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). In sociology from 1879.
stratify (v.)
1660s, from French stratifier, from Modern Latin stratificare, from stratum (see stratum). Related: Stratified; stratifying.
stratigraphy (n.)
"description of strata," 1865, from Latin strati-, combining form of stratum (see stratum) + -graphy. Related: Stratigraphic; stratigraphical.