Home › Words › H › hyperthecosishyperthecosishyperthecosis · noun — hyperplasia of the theca interna of the ovary.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom hyper- + theca + -osis.nounhyperplasia of the theca interna of the ovaryDefinitions & examples from Wiktionary (CC BY-SA 3.0).