Definition of upstream in English:

upstream

Line breaks: up|stream

adverb /ʌpˈstriːm/ & adjective

Pronunciation: /ˈʌpstriːm
 
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  • 1Moving or situated in the opposite direction from that in which a stream or river flows; nearer to the source: [as adverb]: a lone motor cruiser rumbled upstream [as adjective]: the upstream stretch of the Nene
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    • In the August sunshine the salmon battle their way upstream against the fast flowing creek.
    • Lava flowing into waterways could create a hazard in the rivers upstream and enough ash would be carried by the wind to endanger aircraft and communities in the wind's direction.
    • When the medieval bridge was replaced with New London Bridge in 1831, the river could flow freely further upstream.
  • 2 Biology Situated in or towards the part of a sequence of genetic material where transcription takes place earlier than at a given point.
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    • In our case, the reference set was the upstream sequences of all the Arabidopsis genes.
    • The sequences upstream and downstream of the R-genes were examined to determine if clustering of genes could be detected.
    • Additional upstream sequences were needed to map the recombination breakpoints more precisely.
  • 3At a stage in the process of gas or oil extraction and production before the raw material is ready for refining.
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    • He has also worked in communications, health, safety and environment at Shell, and spent much of his earlier career in upstream oil and gas production.
    • Heavey said that Tullow, as an upstream producer, will benefit in the short term if oil prices take longer to fall back to $22 a barrel.
    • The company's annual output also now establishes it as Canada's second-largest upstream producer.

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