Any process that stops, prevents or reduces the frequency, rate or extent of oogenesis. [ GOC:TermGenie http://www.ncbi.nlm.nih.gov/pubmed/26434723 http://purl.obolibrary.org/obo/go/references/0000058 ]
Synonyms: down regulation of ovum development negative regulation of ovum development downregulation of oogenesis down-regulation of ovum development down regulation of oogenesis downregulation of ovum development down-regulation of oogenesis