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old woman
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olefin
o·le·fin [ ṓləfin ] (plural o·le·fins)


noun 
Definition:
 
1. synthetic fiber: a synthetic fiber that is a long chain of polymers
2. chemistry 
Same as  alkene
[Mid-19th century. < French (gaz) oléfiant "oil-forming (gas)" < Latin oleum "oil" (see oil)]
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