Genitus
From Glossary of Meteorology
genitus
Used when a cloud forms from a part of another cloud.
It is then given the name of the appropriate genus, followed by the name of the genus of the mother-cloud with the addition of the suffix "genitus" (e.g., stratocumulus cumulogenitus).
Compare mutatus.
Compare mutatus.
World Meteorological Organization 1956. International Cloud Atlas. Volume I, p. 6.