neci-, nici- +

1. Damaging or injuring participants on both sides of a conflict or struggle.
2. Characterized by bloodshed or carnage.

The original meaning of internecine: "attended by great slaughter".

Total destruction; perdition; ruin.

In medicine, seemingly pernicious; a term applied to a condition which is apparently, but not actually, pernicious or malignant.

The quality of being pernicious, destructiveness.

1. Causing great harm, destruction, or death.
2. Wickedness or causing harm; perniciously.

A severe form of anemia, found mostly in older adults, that results from the body's inability to absorb vitamin B12.

Symptoms include weakness, breathing difficulties, and weight loss.

Patients who have this disorder do not produce the substance in the stomach that allows the body to absorb vitamin B12. This substance is called intrinsic factor (IF).

Pernicious anemia is characterized by the presence in the blood of large, immature, nucleated cells (megaloblasts) that are forerunners of red blood cells. (Red blood cells, when mature, have no nucleus). It is thus a type of megaloblastic anemia.

1. Destructively; with ruinous tendency or effects.
2. In a pernicious manner; destructively, ruinously; wickedly.
3. Deadly; fatal: "There was a perniciously dangerous disease spreading in the community."

1. Grave harmfulness or deadliness.
2. The quality of being very injurious, mischievous or destructive.
3. A reference to being pernicious; destructiveness, ruinousness.