píbuzného

Píbuzného is a term used in some Slavic languages, primarily Czech and Slovak, to refer to a brother-in-law. It specifically denotes the brother of one's spouse. The term is derived from the Proto-Slavic root *pъjь (pijь), meaning "brother-in-law," and the possessive suffix *-ovъ (-ov) combined with the noun *synъ (syn) meaning "son," although the exact etymological development is debated.

In familial relationships, the píbuzného holds a specific position. He is the male sibling of either one's husband or wife. This relationship is distinct from other in-law connections, such as a sister-in-law (švagrová) or a spouse's parents (tchán and tchyně). The social and familial significance of the píbuzného can vary across different cultures and regions within the Slavic world, but generally, he is considered a close relative by marriage.

The concept of píbuzného is important for understanding kinship structures and social networks in these cultures. It highlights the way in which marriage extends family ties beyond the immediate blood relations. While the term is direct and specific, its usage and the nature of the relationship it describes can be influenced by broader cultural norms and individual family dynamics.