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polyethylene glycol
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polygonum

po·lyg·o·num [ pə líggənəm ] (plural po·lyg·o·nums)


noun 
Definition:
 
plant with knotty stem joints: a plant with bulbous stem joints and spikes of small flowers. Genus Polygonum.

[Early 18th century. Via modern Latin< Greek polugonon "knotgrass," literally "many-jointed" < gonu "knee, joint"]
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