tributyl phosphate
noun
tri·butyl phosphate
(ˈ)trī+-
: a liquid inorganic ester (C4H9)3PO4 made from normal butyl alcohol and phosphorus oxychloride and used chiefly as a solvent and plasticizer (as for nitrocellulose lacquers and cellulose plastics)
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Merriam-Webster unabridged
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