двоюродный

• двою́рный (dvojúrnyj) — nonstandard

From Old East Slavic дъвою родꙋ (dŭvoju rodu, “of two generations”) + -ный (-nyj). дъвою (dŭvoju) is a genitive dual form, from which -ю- (-ju-) was extracted and used analogously in трою́родный (trojúrodnyj), четверою́родный (četverojúrodnyj).

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• (non-standard) IPA^(key):  (phonetic respelling: двою́рный)

двою́родный • (dvojúrodnyj)

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

   двою́родный дед ― dvojúrodnyj ded ― great uncle, grandfather’s generation

   двою́родный дя́дя ― dvojúrodnyj djádja ― male first cousin once removed, uncle’s generation

   двою́родный брат ― dvojúrodnyj brat ― male first cousin, brother’s generation

   двою́родный племя́нник ― dvojúrodnyj plemjánnik ― male first cousin once removed, nephew’s generation

   двою́родный внук ― dvojúrodnyj vnuk ― grandnephew, grandson’s generation

   двою́родный пра́внук ― dvojúrodnyj právnuk ― great-grandnephew, great-grandson’s generation

• There is no single equivalent of this term in English. It is applied to close relations (e.g. brothers, uncles, grandfathers) 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. For example, the двою́родный equivalent of one's brother is one's first cousin, because one has a common father with one's brother, but a common grandfather with one's first cousin. Similarly, the двою́родный equivalent of one's grandfather is one's great uncle, because the nearest common ancestor between one and one's grandfather is the grandfather himself, whereas the nearest common ancestor between one and one's great uncle is one's great-grandfather. (The двою́родный equivalent of one's father is one's uncle, but there is already a special term for this relationship.)