Serbo-Croatian Alternative forms plijȇsan (Ijekavian) Etymology From Proto-Slavic *plěsnь. Pronunciation IPA(key): /plêːsan/ Hyphenation: ple‧san Noun plȇsan f (Cyrillic spelling пле̑сан) mildew, mold Declension Declension of plesan singular nominative plȇsan genitive plȇsni dative plȇsni accusative plȇsan vocative plȇsni locative plȇsni instrumental plȇšnju