Synthetic.

Synthetic resins and allied plastics Morrell, R. S. 1951 Synthetic resins for facings of dams Author not listed 1982 Synthetic resins in coating Preuss, Harold P. 1965 Tape yarns Hossack, D. C. 1971 The applications of synthetic resin emulsions Warson, Henry 1972 The chemistry of phenolic resins Martin, Robert W. 1956 The new option in low-dose oral contraception edited by P. Lopes and S.R. Killick 1996