двоюрідний

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From Old East Slavic дъвою родꙋ (dŭvoju rodu, “of two families, family lines”) + -ний (-nyj).

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двою́рідний • (dvojúridnyj)

1. (Denotes a relative in the same generation as the head noun but one degree greater in separation.)

   двою́рідний дід ― dvojúridnyj did ― great-uncle, grandfather's/grandmother's generation

   двою́рідна ба́ба ― dvojúridna bába ― great-aunt, grandfather's/grandmother's generation

   двою́рідний дя́дько ― dvojúridnyj djádʹko ― male first cousin once removed, uncle's/aunt's generation

   двою́рідна ті́тка ― dvojúridna títka ― female first cousin once removed, uncle's/aunt's generation

   двою́рідний брат ― dvojúridnyj brat ― male first cousin, brother's/sister's generation

   двою́рідна сестра́ ― dvojúridna sestrá ― female first cousin, brother's/sister's generation

   двою́рідний племі́нник ― dvojúridnyj plemínnyk ― male first cousin once removed, nephew's/niece's generation

   двою́рідна племі́нниця ― dvojúridna plemínnycja ― female first cousin once removed, brother's/sister's generation

• There is no simple equivalent of this term in English. It is applied to closer relations (e.g. nephews/nieces, brothers/sisters, uncles/aunts, grandfathers/grandmothers) and indicates a relation that is in the same generation as the term being modified, but is one degree greater in separation in terms of the closest common ancestor.

• “двоюрідний”, in Словник.ua (in Ukrainian)
• “двоюрідний”, in Горох – Словозміна (in Ukrainian)