U-stem derivative of <span class="searchmatch">Proto</span>-Indo-European *sweyd- (“to sweat”). *<span class="searchmatch">sweidus</span> m swelling Matasović reconstructs *<span class="searchmatch">sweidus</span> only for Goidelic based on the genitive...
From <span class="searchmatch">Proto</span>-<span class="searchmatch">Celtic</span> *<span class="searchmatch">sweidus</span>. Cognate with Classical Gaelic siat, siad. *hwuɨð m swelling Breton: c'hwez (“air used to inflate something, swelling, vanity”)...
*swissiyū (suffixed with *-tiyū) ⇒ Old Irish: úrphaisiu (“cancer”) *<span class="searchmatch">sweidus</span> <span class="searchmatch">Proto</span>-Brythonic: *hwuɨðɨd Middle Welsh: chwydo, hwydo Welsh: chwyddo ^ Schumacher...