amyloid Tissue consisting of protein fibrils that may accumulate between cells in various animal tissues, especially in the disorder amyloidosis. Amyloid deposits are insoluble and can exert pressure on various vital organs. These deposits are generally detected by staining with the dye Congo red. A build-up of amyloid tissue in the brain is a feature of Alzheimer's disease, Creutzfeldt–Jakob disease, and bovine spongiform encephalopathy.
amyloid (am-i-loid) n. a glycoprotein, resembling starch, that is deposited in the internal organs in amyloidosis. β-amyloid protein has been found in the brains of Alzheimer's patients.
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