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авункулат n stresses
ethnogr.	avunculate (The term "avunculate" comes from the Latin word avunculus, which is a kinship term used to describe the brother of the mother, in opposition to the brother of the father, the patruus. In the societies where maternal filiation is strongly represented, the role of a father could be taken over by a maternal uncle, who would become a "social father" of his sister's children. wikipedia.org igisheva)
Russian thesaurus
авункулат n
gen.	обычай, устанавливающий права и обязательства между дядей с материнской стороны и племянниками. Сохраняет связь детей с родом матери в эпоху патриархата. Известен у многих древних и как пережиток у некоторых современных народов. Большой Энциклопедический словарь