hereditary disease: a hereditary disease starting in infancy that affects various glands and results in secretion of thick mucus that blocks internal passages, including those of the lungs, causing respiratory infections.
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The pancreas is also affected, resulting in a deficiency of digestive enzymes and impaired nutrition.
Merriam-Webster Online Dictionarycystic fibrosis (noun)
a hereditary disease especially among whites that appears usually in early childhood, is inherited as an autosomal recessive trait, involves functional disorder of the exocrine glands, and is marked especially by faulty digestion due to a deficiency of pancreatic enzymes, by difficulty in breathing due to mucus accumulation in airways, and by excessive loss of salt in the sweat