10. 
    nicotine
    noun an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide
    Found op http://wordnetweb.princeton.edu/perl/webwn?s=nicotine
    
    
11. 
    nicotine
    (nik´o-tēn) (nik´o-tin) a very poisonous alkaloid that in its pure state is a colorless, pungent, oily liquid with an acrid, burning taste. It is a constituent of tobacco and can also be produced synthetically. Preparations are administered orally, intranasally, or by inhalation to help peopl...
    Found op http://www.encyclo.co.uk/local/21001
    
    
12. 
    Nicotine
    • (n.) An alkaloid which is the active principle of tobacco. It is a colorless, transparent, oily liquid, having an acrid odor, and an acrid burning taste. It is intensely poisonous. • (n.) An alkaloid which is the active principle of tobacco. It is a colorless, transparent, oily liquid, h...
    Found op http://thinkexist.com/dictionary/meaning/nicotine/
    
    
13. 
    nicotine
    an organic compound that is the principal alkaloid of tobacco. (An alkaloid is one of a group of nitrogenous organic compounds that have marked ... [7 related articles]
    Found op http://www.britannica.com/eb/a-z/n/40
    
    
14. 
    Nicotine
    In low concentrations (an average cigarette yields about 1 mg of absorbed nicotine), the substance acts as a stimulant in mammals and is the main factor responsible for the dependence-forming properties of tobacco smoking. According to the American Heart Association, nicotine addiction has historic...
    Found op http://en.wikipedia.org/wiki/Nicotine
    
    
15. 
    Nicotine
    The main ingredient in tobacco, which is extremely poisonous and causes irritation of lung tissues, constriction of blood vessels, increased blood pressure and heart rate in smokers and those around a smoker. Because nicotine crosses the placenta, it keeps the fetus from getting the proper supply of...
    Found op http://www.pregnology.com/AZ/N/2
    
    
16. 
    nicotine
    nicotine, C10H14N2, poisonous, pale yellow, oily liquid alkaloid with a pungent odor and an acrid taste. It turns brown on exposure to air. Nicotine, a naturally occurring constituent of tobacco, is the active ingredient in tobacco smoke. The amount of nicotine in tobacco leaves ranges from approxim...
    Found op http://www.infoplease.com/ce6/sci/A0835624.html
    
    
17. 
    Nicotine
    Nicotine is an alkaloid derived from the leaves of tobacco.
    Found op http://www.probertencyclopaedia.com/browse/GN.HTM
    
    
18. 
    nicotine
    Alkaloid (nitrogenous compound) obtained from the dried leaves of the tobacco plant Nicotiana tabacum. A colourless oil, soluble in water, it turns brown on exposure to the air. Nicotine is found in tobacco smoke. It can be described as a recreational drug. It stimulates the human body and pr...
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0010081.html
    
    
19. 
    nicotine
    An addictive, poisonous chemical found in tobacco. It can also be made in the laboratory. When it enters the body, nicotine causes an increased heart rate and use of oxygen by the heart, and a sense of well-being and relaxation. It is also used as an insecticide.
    Found op http://www.cancer.gov/dictionary?expand=N
    
    
20. 
    nicotine
    1) Alkaloid 2) Alkaloid derived from the leaves of tobacco 3) Alkaloid in tomatoes 4) Certain craving 5) Phytotoxin 6) Plant toxin 7) Source of addiction 8) Stain maker 9) Vasoconstrictive 10) Vasoconstrictor
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/nicotine/1
    
    

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