Nomen illegitimum (Latin for illegitimate name) is a technical term used mainly in botany. It is usually abbreviated as nom. illeg. Although the International Code of Nomenclature for algae, fungi, and plants uses Latin terms as qualifiers for taxon names (e.g. nomen conservandum for "conserved name", and nomen superfluum for "superfluous name"), the definition of each term is in English rather than Latin.[1] The Latin abbreviations are widely used by botanists and mycologists.