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midterm + n.
midterm 作形容词，表示“中期的”，常放在名词前，如 midterm exam（期中考试）、midterm report（中期报告）。
The midterm results were published today.
中期结果今天公布了。
妊娠中期
先理解核心含义，再看它在真实句子里的用法。
妊娠中期
the middle of the gestation period
The midterm results were published today.
中期结果今天公布了。
此处指妊娠中期，不是期中考试。
学期中段的学校考试,即期中考试。
A midterm school exam (i.e., halfway through the term).
妊娠期的中期
the middle of the gestation period
中期选举。
A midterm election.
学期或政治任期的中期
middle of an academic term or a political term in office
At midterm, the doctor checked the baby's position and size.
妊娠中期时，医生检查了宝宝的胎位和大小。
She felt more energetic during midterm than in the early months.
她在妊娠中期比头几个月更有精力。
They took a weekend trip around midterm to celebrate the good news.
他们在妊娠中期前后进行了一次周末旅行，庆祝这个好消息。
midterm 作形容词，表示“中期的”，常放在名词前，如 midterm exam（期中考试）、midterm report（中期报告）。
The midterm results were published today.
中期结果今天公布了。
midterm 作名词可指期中考试，常用复数 midterms；take 是常见搭配。
She took a midterm in chemistry.
她参加了化学的期中考试。
在医学语境中，midterm 指妊娠中期，通常带介词 at，不加冠词。
The pregnancy is at midterm.
怀孕到了中期。
Not this
I have midterm tomorrow.
Use this
I have a midterm tomorrow.
midterm 作名词表示“期中考试”时为可数名词，前面需要冠词或限定词（如 a/the）；汉语没有冠词，学习者容易漏掉。
Not this
I did well in my midterm.
Use this
I did well on my midterm.
表示在某场考试中表现如何，英语介词用 on，不用 in；in 常用于“在某门课程或领域方面”（如 in math）。这是受汉语“在期中考试中”直译影响的介词误用。
Not this
The midterm of the movie was boring.
Use this
The middle of the movie was boring.
midterm 作名词通常指“期中考试”或“学期中的某个时间点”，不能泛指事物的“中间部分”；表示一般事物的中间部分要用 middle。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
期中考试
The midterm exam covers everything from the first half of the semester.
期中考试涵盖本学期前半部分的所有内容。
参加期中考试
I'm going to take a midterm in biology this afternoon.
我今天下午要参加生物期中考试。
为期中考试复习
He stayed up late studying for the midterm.
他熬夜为期中考试复习。
期中成绩
Her midterm grade brought down her final average.
她的期中成绩拉低了最终平均分。
期中考试周
Most professors schedule their exams during midterm week.
大多数教授会把考试安排在期中考试周。
期中考试考得好
If you do well on the midterm, you can relax a bit.
如果你期中考试考得好，就可以稍微放松一下。
Use midterm naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
mid=中间，term=学期；学期走到中间，就是“期中考试”。想象日历停在学期正中央那一天，midterm 来了。
语域：formal 常见场景：obstetrics、medical records 该义项表示妊娠中期，属于医学术语，比较正式，多用于产科检查、孕期记录和医学文献等专业语境。
形容词 midterm 只能作定语，不能作表语。
Dictionary facts from ECDICT, WIKTIONARY.