phthalate (FTHAY-layt, THAY-layt) - n., a salt or ester of phthalic acid, commonly used as a plasticizer.
That is, added to plastics (especially PVC) to make them more flexible. It's of some controversy because of health effects, especially on prenatal development;
Wikipedia has a brief summary and oodles of further reading. Phthalic acid, fwiw,
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