onion mildew onion maggot • onion red · · · Info · Definitions · Synonyms · Characters · · onion mildew · · Text Common · · Latin · · Scripts 12 · · Length Definitions · · · (noun) fungus causing a downy mildew on onions. Synonyms: Peronospora destructor. · · Noun Definition 1 Synonyms · · · onion · · Synonym 1 onion plant · · Synonym 2 allium cepa · · Synonym 3 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