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pyramid scheme
pyramid selling
pyramidal peak
pyramidal tract
Pyramus and Thisbe
pyran
pyranose
pyrargyrite
pyrazine
pyrazole
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pyrazine

py·ra·zine [ pírrə zn ] (plural py·ra·zines)


noun 
Definition:
 
structural form of carbon-nitrogen compound: a chemical compound whose structural formula consists of a ring with four carbon atoms and two nitrogen atoms in which the nitrogen atoms are separated by two carbon atoms

[Late 19th century. <pyridine + azo-]
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