This is the 6610th most frequent Japanese word.
ドク
"ドク" (doku) means "poison" in English.
In this sentence, "ドク" refers to "poison" or harmful substance in the context of medicine.
この薬にはドクがあります。
This medicine contains poison.
Here, "ドク" is used to mean "toxins" or dangerous substances in an academic/scientific context.
彼は大学で医学とドクについて勉強しています。
He is studying medicine and toxins at the university.
In this example, "ドク" describes naturally occurring "poison" in animals like snakes or spiders.