From *piti (“to drink”) + *-anъ. *<span class="searchmatch">pьjanъ</span> drunk East <span class="searchmatch">Slavic</span>: Old East <span class="searchmatch">Slavic</span>: *пьꙗнъ (*pĭjanŭ) Old Ruthenian: пъꙗный (pʺjanyj), пьꙗный (pʹjanyj), пꙗный...
*piti (“drink”) → *<span class="searchmatch">pьjanъ</span> (“drunk”) <span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span> terms suffixed with *-ěnъ Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/botьjanъ Reconstruction:<span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>/dъždžěnъ...
e.g. post-<span class="searchmatch">Proto</span>-Indo-European *musī (“fly”) (cf. Ancient Greek μυῖα (muîa), Latin musca) > Pre-<span class="searchmatch">Slavic</span> *mus-ī-k- > *mux-ī-k-ā > Common <span class="searchmatch">Slavic</span> *mъšica (“fly”)...
*pijati *<span class="searchmatch">pьjanъ</span> *pьjavъka, *pijavica *pirъ *pitь *pitьnъ *pivo (“drink, beer”) *pojiti (“to give to drink”) *pojь (“beverage, drink”) East <span class="searchmatch">Slavic</span>: Old East...