By surface analysis, *vъ(n)- + *zajьmъ + *-ьnъ. *<span class="searchmatch">vъzajьmьnъ</span> mutual East <span class="searchmatch">Slavic</span>: Old East <span class="searchmatch">Slavic</span>: възаимьнъ (vŭzaimĭnŭ) Old Ruthenian: взає́мный (vzajémnyj)...
Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/vъnǫtrьnъ Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/<span class="searchmatch">vъzajьmьnъ</span> Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/xabьnъ Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/xlěbьnъ...