期刊 means "periodical" or "journal" and refers to publications issued at regular intervals, such as academic journals or magazines. The word combines 期 (period/issue) with 刊 (publication). It is commonly used in academic and formal contexts, as in 期刊上发表 (publish in a journal).
这篇论文发表在一本国际期刊上。
Zhè piān lùnwén fābiǎo zài yī běn guójì qīkān shàng.
This paper was published in an international journal.
图书馆里有很多学术期刊可以查阅。
Túshūguǎn lǐ yǒu hěn duō xuéshù qīkān kěyǐ cháyuè.
There are many academic journals available for reference in the library.
他正在为一本医学期刊写文章。
tā zhèngzài wèi yī běn yīxué qīkān xiě wénzhāng.
He is writing an article for a medical journal.