synthetic resin: a resin having a polymeric structure; especially a resin in the raw state; used chiefly in plastics
polymer: a naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers
spina bifida: a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis