Pentylenetetrazol Definition
 pĕntə-lēntĕtrə-zôl, -zōl, -zŏl 
    noun
  
 A white, crystalline powder, C6H10N4, used as a circulatory and respiratory stimulant and formerly in shock therapy.
 Webster's New World 
Synonyms: 
  Origin of Pentylenetetrazol
pent(a)– (meth)ylene tetr(a)– az(o)– –ol(e)
From American Heritage Dictionary of the English Language, 5th Edition
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