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 (ăt′ə-nē, ăt′n-ē)
1. Lack of normal muscle tone.
2. Lack of accent or stress.

[Late Latin atonia, from Greek atoniā, from atonos, slack : a-, without; see a-1 + tonos, stretching, tone; see tone.]


1. (Pathology) pathol lack of normal tone or tension, as in muscles; abnormal relaxation of a muscle
2. (Phonetics & Phonology) phonetics lack of stress or accent on a syllable or word
[C17: from Latin atonia, from Greek: tonelessness, from atonos slack, from a-1 + tonos tone]


(ˈæt n i)

also a•to•ni•a

(əˈtoʊ ni ə, eɪˈtoʊ-)

1. lack of tone or energy; muscular weakness, esp. in a contractile organ.
2. lack of stress accent.
[1685–95; < Late Latin atonia < Greek, derivative of átonos unaccented, languid, literally, toneless. See a-6, tone]

atonicity, atony

lack of tone or tonus in the body; poor muscular condition. Cf. tonicity.atonic, adj.
See also: Body, Human
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.atony - lack of normal muscular tension or tonus
condition, status - a state at a particular time; "a condition (or state) of disrepair"; "the current status of the arms negotiations"
References in periodicals archive ?
Prolonged labour13 and multi-parity leads to an increased risk of post-partum hemorrhage because of uterine atony in third world, leading to increased maternal mortality and morbidity16.
Bethanechol is a cholinergic agent used to treat urinary retention related to bladder atony.
Atony, morbidly adherent placenta and uterine rupture were the three chief indications for the procedure [Table 2].
Although uterine atony remained the main cause of MT, there was a rising trend for placental abnormalities (especially placenta accreta) in the second 5-year group compared with the first 5-year group (34% vs.
ATONY ADAMS has taken Nigel Reo-Coker and Kieran Richardson on trial at Granada.
Regarding post partum complications 5(10%) patients had post partum hemorrhage due to uterine atony, 4(8%) had post partum hemorrhage due to retained placenta, 2(4%) had perineal tears, 3(6%) had subtotal hysterectomy and 36(72%) didn't had complications.
The other risk factors for stone formation are ureteral atony, occlusion, family history, and urinary tract infection.
The reasons for surgical intervention of atony, placental abruption, uterine rupture, uterine inversion, placenta previa totalis, and placenta accreta were similar in both groups (p=0.
However the cause of uterine prolapse is unknown, predisposing factors include severe tenesmus, over relaxation of the pelvic musculature, uterine atony, incomplete placental seperation and flaccid mesovaria (Jutkowitz, 2005; Nothling et al.
Megaesophagus is an esophageal dysfunction resulting from atony of the esophageal musculature characterized by flaccidity and luminal dilation, as a consequence of segmental or diffused motor dysfunction of the esophageal body (TORRES, 1997).
At the pathological level, the causes of excessive bleeding at CD are uterine atony (commonly after prolonged labour), uterine trauma (excessive bleeding from uterine incision or additional tears laterally into the broad ligament or vertically down the lower segment) and placental site bleeding (associated with placenta praevia, previous CD and/or morbidly adherent placenta).
Uterine atony is the most common cause of PPH (70%), but genital tract trauma (i.