onion mildew onion maggot • onionpeel · · · Info · Definitions · Synonyms · Characters · · onion mildew · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) fungus causing a downy mildew on onions. Synonyms: onion mildew, Peronospora destructor. · · Noun Definition 1 Synonyms · · · peronospora destructor · · Synonym 1 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F w latin small letter w U+0077