過か期き産さんかきさんMeanings1nounpost-term delivery; postmature deliverymedicineMedical term for delivery after 42 weeks of gestation. Antonym: 早産 (preterm delivery).Antonyms: 早産過か期き産さんは妊にん娠しん42週しゅう以い降こうの分ぶん娩べんを指さす。Post-term delivery refers to childbirth after 42 weeks of gestation.