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profligate
profound
profundity
profuse
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progenitor
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progeria
progestational
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progenitor

pro·gen·i·tor [ prō jénnitər ] (plural pro·gen·i·tors)


noun 
Definition:
 
1. ancestor: a direct ancestor of somebody or something

2. originator: the originator of or original model for something

[14th century. < Latin, "begetter" < progenit-, past participle of progignere< gignere "beget"]
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