Amyloid refers to an abnormal protein that accumulates in the tissues of individuals suffering from certain diseases such as Alzheimer's disease. Antonyms for the word amyloid include normal, healthy, non-amyloid, and non-proteinaceous. Normal signifies a state of being typical or common and free from any abnormality, while healthy denotes a state of good physical, emotional, and mental well-being. Non-amyloid indicates the absence of amyloid protein, whereas non-proteinaceous means not composed of proteins. These antonyms are useful in highlighting the contrast between the presence and absence of abnormal protein deposits in tissues.