10. 
    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
    
    
11. 
    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
    
    
12. 
    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/
    
    
13. 
    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
    
    
14. 
    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
    
    
15. 
    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)
    
    
16. 
    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)
    
    
17. 
    precursor
    intermediate material used to form a final superconductor
    Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=815-05-26
    
    
18. 
    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
    
    
19. 
    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
    
    
20. 
    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
    
    
21. 
    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)
    
    
22. 
    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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