noun
Refers to a biological parasite or, by extension, a person who lives off others. Common in compounds like パラサイトシングル (parasite single).
この虫は他の昆虫に寄生するパラサイトです。
This insect is a parasite that lives off other insects.
彼は親に頼って暮らすパラサイト
He is like a parasite, living off his parents.