| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
amyloidosis am·y·loid·o·sis (ām'ə-loi-dō'sĭs)
n.
A disorder marked by the deposition of amyloid in various organs and tissues of the body that may be associated with a chronic disease such as rheumatoid arthritis, tuberculosis, or multiple myeloma.