Look up: Precursor


  1. Precursor
    In photochemistry, a compound antecedent to a pollutant. For example, volatile organic compounds (VOCs) and nitric oxides of nitrogen react in sunlight to form ozone or other photochemical oxidants. As such, VOCs and oxides of nitrogen are precursors.
    Found op http://www.epa.gov/OCEPAterms/

  2. Precursor
    The chemical element that changes due to enzymatic or physical pressure.
    Found op http://www.encyclo.co.uk/visitor-contributions.php

  3. precursor
    [n] - a person who goes before or announces the coming of another
    Found op http://www.webdictionary.co.uk/definition.php?query=precursor

  4. precursor
    Substance from which another, usually more biologically active, substance is formed.
    Found op http://sis.nlm.nih.gov/enviro/iupacglossary/glossaryp.html

  5. Precursor
    Any chemical reactant which takes part at any stage in the production of a toxic chemical, including any key component of a binary or multicomponent chemical system.
    Found op http://www.chemicalglossary.net/definition/1283-PRECURSOR

  6. Precursor
    In metabolism, a chemical substance from which another chemical substance is formed
    Found op http://www.chemicalglossary.net/definition/1308-Precursor

  7. Precursor
    Something that precedes, e.g., a sign or symptom that forewarns of another, such as muscle aching may be the precursor of a tremor.
    Found op http://www.encyclo.co.uk/visitor-contributions.php

  8. Precursor
    Material from which carbon fiber is made by pyrolysis. Common precursors are polyacrylonitrile (PAN), rayon and pitch.
    Found op http://www.komprex.com/Glossary/index.htm

  9. Precursor
    Precursor: Forerunner. That which precedes or is derived from an available source. The term 'precursor' is applied to an inactive substance converted to an active one (such as an enzyme, vitamin, or hormone). The term 'precursor' applies to any chemical that is transformed into another. From the Lat...
    Found op http://www.medterms.com/script/main/art.html?articlekey=14105

  10. Precursor
    Pre·cur'sor noun [ Latin praecursor , from praecurrere to run before; prae before + currere to run. See Course .] One who, or that which, precedes an event, and indicates its approach; a forerunner; a harbinger. �...
    Found op http://www.encyclo.co.uk/webster/P/146

  11. precursor
    Something that precedes. ... 1. <biochemistry> In biological processes, a substance from which another, usually more active or mature substance is formed. ... 2. In clinical medicine, a sign or symptom that heralds another. ... Origin: L. Praecursor = a forerunner ... (18 Nov 1997) ...
    Found op http://www.mondofacto.com/facts/dictionary?precursor

  12. precursor
    forerunner noun a person who goes before or announces the coming of another
    Found op http://wordnetweb.princeton.edu/perl/webwn?s=precursor



  1. precursor
    noun a substance from which another substance is formed (especially by a metabolic reaction)
    Found op http://wordnetweb.princeton.edu/perl/webwn?s=precursor

  2. precursor
    (pre´kәr-sәr) something that precedes. In biological processes, a substance from which another, usually more active or mature substance, is formed. In clinical medicine, a sign or symptom that heralds another.
    Found op http://www.encyclo.co.uk/local/21001

  3. Precursor
    • (n.) One who, or that which, precedes an event, and indicates its approach; a forerunner; a harbinger.
    Found op http://thinkexist.com/dictionary/meaning/precursor/

  4. precursor
    (L. praecursor a forerunner) something that precedes. In biological processes, a substance from which another, usually more active or mature substance is formed. In clinical medicine, a sign or symptom that heralds another.
    Found op http://users.ugent.be/~rvdstich/eugloss/DIC/dictio70.html

  5. precursor
    precursor 1. A person or thing that precedes, as in a job, a method, etc.; a predecessor. 2. A person, animal, or thing that goes before and indicates the approach of someone or something else; a harbinger: 'The budding of tree leaves is a precursor of spring.' 3. A chemical that is transformed into...
    Found op http://www.wordinfo.info/words/index/info/view_unit/1744/5

  6. Precursor
    [bird] "Precursor" magnus "Precursor" parvus (type) "Precursor" is a controversial prehistoric bird genus from the Early Eocene{Verify source|date=November 2007}. It was established based on fossils found in England, e.g. in the famous London Clay deposits. Three species have been named, but...
    Found op http://en.wikipedia.org/wiki/Precursor_(bird)

  7. Precursor
    [chemistry] In chemistry, a precursor is a compound that participates in the chemical reaction that produces another compound. In biochemistry, the term "precursor" is used more specifically to refer to a chemical compound preceding another in a metabolic pathway. ...
    Found op http://en.wikipedia.org/wiki/Precursor_(chemistry)

  8. precursor
    intermediate material used to form a final superconductor
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=815-05-26

  9. precursor
    Type: Term Pronunciation: prē-kŭr′sŏr Definitions: 1. That which precedes another or from which another is derived, applied especially to a physiologically inactive substance that is converted to an active enzyme, vitamin, hormone, etc., or to a chemical substance that is built ...
    Found op http://www.medilexicon.com/medicaldictionary.php?t=71749

  10. Precursor
    In photochemistry, a compound antecedent to a pollutant. For example, volatile organic compounds (VOCs) and nitrogen oxides react in sunlight to form ozone or other photochemical oxidants. As such, VOCs and oxides of nitrogen are precursors.
    Found op http://www.4cleanair.org/glossary.html

  11. Precursor
    A change in the geological or geophysical conditions that is a forerunner to earthquake generation on a fault. Precursors cannot reliably be recognized as such beforehand.
    Found op http://earthquakescanada.nrcan.gc.ca/info-gen/glossa-eng.php

  12. Precursor
    [physics] Therefore, one can determine the approximate period of a precursor waveform at a particular distance and time by calculating the period of the frequency component that would arrive at that distance and time based on its group velocity. In a region of normal dispersion, high-frequen...
    Found op http://en.wikipedia.org/wiki/Precursor_(physics)

  13. precursor
    1) Ancestor 2) Antecedent 3) Avant-coureur 4) Avant-courier 5) Avant-garde 6) Bellmare 7) Bellwether 8) Dawn 9) Forebear 10) Foreboding 11) Forelooper 12) Foreloper 13) Forerunner 14) Harbinger 15)
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/precursor/1

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