This is the 12939th most frequent Korean word.
독이라는
"독이라는" translates to "called poison" or "described as poison" in English.
In this sentence, 독이라는 defines a rumor or information indicating that something is poisonous. It acts as an explanatory modifier for the word 소문 (rumor).
이 음식은 독이라는 소문이 있습니다.
This food is rumored to be poisonous.
Here, 독이라는 introduces the notion of a fact (사실) about something being identified as poison. It describes the nature of the subject being discussed.
그는 독이라는 사실을 몰랐습니다.
He didn't know the fact that it was poison.
In this sentence, 독이라는 modifies 말을 (words), indicating the information about the medicine being poison expressed verbally.