Less than 90°

adjective

1. Lasting a short time

   "acute experiments"

2. Being or forming an angle measuring less than 90 degrees

   "an acute angle"

3. Composed of acute angles

   "an acute triangle"

4. Having the form ´
5. Marked with an acute accent
6. Of the variety indicated by an acute accent
7. Marked by keen discernment or intellectual perception especially of subtle distinctions

   "an acute thinker"

8. Responsive to slight impressions or stimuli

   "acute hearing"

9. Felt, perceived, or experienced intensely

   "acute distress"

10. Demanding urgent attention

    "an acute emergency"

noun

1. A disease (such as bronchitis, gastroenteritis, or the flu) of rapid onset and relatively short duration

   "As the population gets older, and as medical science triumphs over microbes, the burden is now shifting from acute disease to chronic disease."

noun

1. A serious, rare, neurological condition of sudden onset chiefly affecting young children that causes inflammation of the gray matter of the spinal cord, results in severe, sometimes permanent weakness and loss of muscle tone especially of the arms or legs, and is often preceded by a viral respiratory illness or fever

   "Symptoms associated with acute flaccid myelitis tend to occur about a week after children develop a fever and respiratory illness, causing some to lose the ability to move their face, neck, back, arms or legs."

noun

1. Altitude sickness that is experienced usually within several hours to one day of ascending above 8000 to 10,000 feet (about 2500 to 3000 meters) and that is marked by headache, nausea, loss of appetite, vomiting, insomnia, dizziness, and fatigue, and may lead to serious complications including severe edema of the brain or lungs

noun

1. Infection of the middle ear that is of rapid onset and is marked by inflammation, earache, fever, decreased hearing, fluid in the middle ear, and sometimes rupture of the tympanic membrane

noun

1. Respiratory failure of sudden onset in adults or children that follows injury to the endothelium of the lung (as in sepsis, chest trauma, massive blood transfusion, aspiration of the gastric contents, or pneumonia) and results in the accumulation of protein-rich fluid and the collapse of alveoli leading to difficult, rapid breathing and very low levels of oxygen in the blood

noun

1. Sars

adjective

1. Extremely or excessively acute

   "a hyperacute sensitivity to light"

noun

1. A condition that is marked by the presence of symptoms (such as fatigue, cough, shortness of breath, headache, or brain fog) which persist for an extended period of time (such as weeks or months) following a person's initial recovery from COVID-19 infection long covid

   "It is difficult to know who will develop post-COVID syndrome, but a recent study published in the Journal of the American Medical Association reported that 30% of respondents had persistent symptoms."