familial adenomatous polyposis
noun
familial adenomatous pol·yp·o·sis -ˌpä-li-ˈpō-səs 
: an inherited disease of the large intestine marked by the formation especially in the colon and rectum of numerous glandular polyps which typically become malignant if left untreated
called also familial polyposis
Example Sentences
Recent Examples on the Web The company says the drug can be used in the treatment of the rare disease familial adenomatous polyposis, or FAP, an inherited condition that becomes colorectal cancer in patients by age 39 on average. 
Laura Garcia, ExpressNews.com, 30 Aug. 2019
Laura Garcia, ExpressNews.com, 30 Aug. 2019 Word History
Etymology
polyposis presence of polyps, from New Latin, from polypus polyp + -osis
First Known Use
1976, in the meaning defined above
Medical Definition
familial adenomatous polyposis
noun
: a disease of the large intestine that is marked by the formation especially in the colon and rectum of numerous adenomatous polyps which typically become malignant if left untreated, that may be either asymptomatic or accompanied by diarrhea or bleeding, and that is inherited as an autosomal dominant trait —abbreviation FAP
called also adenomatous polyposis coli, familial polyposis