atony
noun
at·o·ny ˈa-tə-nē 
: lack of physiological tone especially of a contractile organ
Example Sentences
Recent Examples on the Web The most common reason for postpartum hemorrhage is uterine atony, according to the American Academy of Family Physicians (AAFP). 
Patia Braithwaite, SELF, 30 July 2019 Bleeding during or after childbirth: Uterine complications during or after childbirth, like when the organ doesn’t contract properly after the baby is out (this is known as uterine atony), can lead to severe hemorrhaging. Zahra Barnes, SELF, 14 Feb. 2018
Patia Braithwaite, SELF, 30 July 2019 Bleeding during or after childbirth: Uterine complications during or after childbirth, like when the organ doesn’t contract properly after the baby is out (this is known as uterine atony), can lead to severe hemorrhaging. Zahra Barnes, SELF, 14 Feb. 2018 Word History
Etymology
Late Latin atonia, from Greek, from atonos without tone, from a- + tonos tone
First Known Use
1693, in the meaning defined above
Medical Definition
atony
noun
at·o·ny ˈat-ᵊn-ē
variants or atonia
(ˈ)ā-ˈtō-nē-ə
plural atonies or atonias
: lack of physiological tone especially of a contractile organ