From *opsa + *-ina. *<span class="searchmatch">opsina</span> f aspen * -asъ is the expected Balto-<span class="searchmatch">Slavic</span> form but is found only in some Old Czech documents; -axъ is found everywhere else...
Reconstruction:Proto-<span class="searchmatch">Slavic</span>/okolina Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/<span class="searchmatch">opsina</span> Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/orvьnina Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/otьčina Reconstruction:<span class="searchmatch">Proto</span>-Slavic/paǫčina...
*opsica *opsičina *opsika *<span class="searchmatch">opsina</span> *opsinьnikъ *opsinьňakъ *opsiňakъ *opsinъka *opsьje *opsьnikъ *opsьňakъ East <span class="searchmatch">Slavic</span>: Old East <span class="searchmatch">Slavic</span>: *оса (*osa) Old Ruthenian:...