【回答】
1、Fever 英 /'fiːvə/ 美 /'fivɚ/
其他表示方法： have [run] a fever; have [run] a temperature; fire; heat
2、英英释义：《朗文当代高级英语辞典》
MEANINGS 义项
1.[C,U] an illness or a medical condition in which you have a very high temperature
发烧，发热
→ hay fever → scarlet fever → yellow fever → glandular fever → rheumatic fever
•Andy has a fever and won’t be coming into work today. 安迪发烧了，今天不来上班。
•I woke up this morning with a fever and an upset stomach. 今天早上醒来时我发烧了，胃也不舒服。
•She’s running a fever (= has a fever ) . 她在发烧。
a high/low/slight fever
•The usual symptoms are a pink rash with a slight fever. 一般症状为出粉红色疹子并伴有低烧。
2.[singular,单数] a situation in which many people feel very excited or feel very strongly about something
高度兴奋，狂热，极端活跃
[+ of]
•a fever of excitement on Wall Street 华尔街的疯狂
election/carnival etc fever (=great interest or excitement about a particular activity or event)选举/狂欢节等的狂热
•Soccer fever has been sweeping the nation as they prepare for the World Cup. 世界杯筹备期间，足球狂潮席卷全国。
3.(at) fever pitch
if people’s feelings are at fever pitch, they are extremely excited
狂热，异常激动，高度活跃
•The nation was at fever pitch in the days leading up to the election. 大选前几天，全国处于狂热的兴奋之中。
•After a night of rioting, tensions in the city reached fever pitch . 一夜骚乱之后，该市的紧张气氛达到了顶点。
Register 语体
In everyday English, people usually use fever to talk about a very high temperature. If someone’s temperature is just high, they say that someone has a temperature rather than has a fever .
在日常英语中，人们说高烧时用fever。要是某人体温只是略高，人们会说someone has a temperature，而不说has a fever
•He stayed home from school because he had a temperature . 因为发烧，他待在家里没去上学。
→ cabin fever
3、维基百科名词解释
Fever, also known as pyrexia and febrile response,is defined as having a temperature above the normal range due to an increase in the body's temperature set point. There is not a single agreed-upon upper limit for normal temperature with sources using values between 37.5 and 38.3 °C (99.5 and 100.9 °F).The increase in set point triggers increased muscle contractions and causes a feeling of cold.This results in greater heat production and efforts to conserve heat. When the set point temperature returns to normal, a person feels hot, becomes flushed, and may begin to sweat. Rarely a fever may trigger a febrile seizure. This is more common in young children. Fevers do not typically go higher than 41 to 42 °C (105.8 to 107.6 °F).
A fever can be caused by many medical conditions ranging from non serious to life threatening. This includes viral, bacterial and parasitic infections such as the common cold, urinary tract infections, meningitis, malaria and appendicitis among others. Non-infectious causes include vasculitis, deep vein thrombosis, side effects of medication, and cancer among others. It differs from hyperthermia, in that hyperthermia is an increase in body temperature over the temperature set point, due to either too much heat production or not enough heat loss.
Treatment to reduce fever is generally not required.[1][8] Treatment of associated pain and inflammation, however, may be useful and help a person rest. Medications such as ibuprofen or paracetamol (acetaminophen) may help with this as well as lower temperature. Measures such as putting a cool damp cloth on the forehead and having a slightly warm bath are not useful and may simply make a person more uncomfortable. Children younger than three months require medical attention, as might people with serious medical problems such as a compromised immune system or people with other symptoms. Hyperthermia does require treatment.
Fever is one of the most common medical signs. It is part of about 30% of healthcare visits by children and occurs in up to 75% of adults who are seriously sick. While fever is a useful defense mechanism, treating fever does not appear to worsen outcomes. Fever is viewed with greater concern by parents and healthcare professionals than it usually deserves, a phenomenon known as fever phobia.
【拓展回答】
1、词组短语
1.high fever 发高烧
2.have a fever 发烧
4.hemorrhagic fever [医]出血热
5.yellow fever [医]黄热病
6.hay fever [医]枯草热；[医]花粉病
7.scarlet fever [病]猩红热
8.typhoid fever 伤寒症
9.rheumatic fever [病]风湿热；急性关节风湿病
10.swine fever 猪瘟疫（等于hog cholera）
11.slight fever 微热，低烧
12.epidemic hemorrhagic fever 流行性出血热
13.cabin fever 幽居病
14.fever of unknown origin 无明显病因的发烧
15.fever pitch n. 狂热；极度兴奋
16.haemorrhagic fever 出血热
17.spring fever 春倦症；枯草热
18.lassa fever n. [医]拉沙热
19.q fever Q热病
20.fever heat 狂热；发热
2、例句
1.
She was knocked over by fever. 她由于发烧而病倒了。来源：《21世纪大英汉词典》
2
He soon rallied from his fever. 他的发烧很快就好了。来源：《21世纪大英汉词典》
3.
He was down with fever, and the doctor advised him to lie up for several days. 他因发烧而病倒了，医生建议他卧床几天。来源：《21世纪大英汉词典》
4.
Then she beheld a most unprecedented thing, a thing so unprecedented，that nothing equal to it had appeared to her even in the blackest deliriums of fever.
同时她看见了一桩破天荒的怪事，怪到无以复加，即使是在她发热期间最可怕的恶梦里，这样的怪事也不曾有过。
5.
The virus causes fever and joint pain but is not usually fatal. 这一病毒会导致发热和关节痛，但是通常并不致命。
6.
Therefore, once a fever has been established, the real question is: what kind of infection isit?
因此，一旦已经确定是发烧，那么真正的问题是：这是一种什么样的传染病？
7.
My stomach seized up like a clenched fist, and nausea rolled into me like a fever.
我的胃像捏紧的拳头一样胀了起来，恶心如发烧似的冲进了我的身躯。
8.
Fever is one manifestation of cold.
发烧是感冒的一种表现形式。
9.
This microbe infects the brain and can cause headache, confusion, motor weakness andfever.
这种微生物可以感染脑部，引起头痛，精神错乱，虚弱和发烧。
10.
If you begin to have fever, chills, vomiting, are unable to urinate, or experience drainage fromyour incisions you should call your surgeon immediately.
如果你开始有发热、打寒颤、呕吐、不能排尿、或者有东西从手术的切口处流出，请立刻通知你的外科医生。
【参考资料】
《朗文当代高级英语辞典》、《韦氏大学英语词典》