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Pyramus and Thisbe
pyran
pyranose
pyrargyrite
pyrazine
pyrazole
pyre
pyrene (1)
pyrene (2)
Pyrenean
Pyrenees
pyrethrin
pyrethrum
pyretic
Pyrex
pyrexia
pyrheliometer
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pyrimidine

py·rim·i·dine [ pī rímmi dn, pi rímmi dn ] (plural py·rim·i·dines)


noun 
Definition:
 
1. crystalline organic compound: a nitrogenous base with a six-sided ring structure

2. pyrimidine derivative: a biologically significant derivative of pyrimidine, especially the bases cytosine, thymine, and uracil found in RNA and DNA

[Late 19th century. <pyridine + imide]
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