IgA Deficiency. Print. IgA deficiency is a defect in the immune system characterized by an inadequate amount of the antibody class known as immunoglobulin A (IgA). Antibodies are large proteins produced by the body to fight infections caused by invaders, such as bacteria, viruses, fungi, parasites, and other foreign agents.
Definition of ultimo. : of or occurring in the month preceding the present.
opera. 1  opera-Actually the Latin plural of opus, labor, work.. 2  prima donna-Meaning principal female singer in an opera, it is from the same Italian phrase meaning first lady; the meaning temperamental person was first recorded in 1834. 3  primo vomo-The principal male singer in an opera.