1Linguistics (of a syllable) without accent or stress.
〔语言学〕无重音的；清音的
Example sentencesExamples
In Portuguese, vowels have stressed (tonic) and unstressed (atonic) forms.
In this kind of metric versification, neither the actual number of the syllables nor the difference between tonic and atonic syllables had much importance.
2Physiology Lacking muscular tone.
〔生理〕（肌肉）弛缓的，缺乏张力的
Example sentencesExamples
Atonic and tonic seizures are characterized by a sudden change in muscle tone.
The highest levels of intoxication can be life-threatening, producing delirium, coma, atonic bladder and cardiac arrhythmias.
In Poliomyelitis the greatest possible care must be taken to prevent bruising atonic muscle fibers.
Derivatives
atony
nounˈatəniˈætni
This in turn leads to gastric atony, floating kidney, hernia, rectal prolapse, uterine prolapse and other forms of prolapse.
Example sentencesExamples
Postpartum uterine atony and hemorrhage can be effectively prevented with the use of oxytocin, but the optimal dosage and route of administration have not been established.
This color can be seen frequently in chronic diseases of the stomach, especially in gastric atony.
Following the birth of the neonate, the placenta was delivered and the patient began to experience severe hemorrhage, which was clinically attributed to uterine atony.
The absence of bowel sounds for a full 5 minutes strongly suggests the existence of intestinal atony or ileus, which has many causes.
Another complication suffered by these patients is bladder atony, in which the muscles of the bladder lose their tone.
Definition of atonic in US English:
atonic
adjectiveāˈtänikeɪˈtɑnɪk
1Linguistics (of a syllable) without accent or stress.
〔语言学〕无重音的；清音的
Example sentencesExamples
In Portuguese, vowels have stressed (tonic) and unstressed (atonic) forms.
In this kind of metric versification, neither the actual number of the syllables nor the difference between tonic and atonic syllables had much importance.
2Physiology Lacking muscular tone.
〔生理〕（肌肉）弛缓的，缺乏张力的
Example sentencesExamples
Atonic and tonic seizures are characterized by a sudden change in muscle tone.
In Poliomyelitis the greatest possible care must be taken to prevent bruising atonic muscle fibers.
The highest levels of intoxication can be life-threatening, producing delirium, coma, atonic bladder and cardiac arrhythmias.