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perpetual inventory
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peroxisome

per·ox·i·some [ pə róksi sm ] (plural per·ox·i·somes)


noun 
Definition:
 
oxidizer of toxic substances: a tiny part within a cell containing enzymes that oxidize toxic substances such as alcohol and prevent them from doing any harm. There are many peroxisomes in the cells of the liver and kidney.

[Mid-20th century. <peroxide + -some1]
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