reductional
/rɪˈdʌkʃ(ə)n(ə)l/ /rɪˈdʌkʃən(ə)l/adjective
1Relating to, of the nature of, or characterized by reduction.
2 Biology. Designating the reduction division of meiosis; relating to or arising from reduction division.
Origin
Late 17th century; earliest use found in Samuel Jeake. From reduction + -al.