pros·ta·glan·din /ˌprɑstəˈglændən/
  pros·ta·glan·din /ˌprɑstəˈglændən/ 名詞
  prostaglandin
       n : potent hormone-like substance found in many bodily tissues
           (and especially in semen); produced in response to trauma
           and may affect blood pressure and metabolism and smooth
           muscle activity