Give the noun-forming suffix which can indicate an abnormal or diseased condition.  Give the suffix which has nephrosis, stenosis and neurosis as examples.

The noun-forming suffix that indicates an abnormal or diseased condition is -osis. This suffix is used in various medical terms to denote a condition or process that is often pathological.

For example:

1. Nephrosis - Refers to a non-inflammatory disease of the kidneys, often characterized by excessive protein loss in the urine.
2. Stenosis - Indicates the abnormal narrowing of a passage or opening in the body, such as blood vessels or the spinal canal, which can lead to various health complications.
3. Neurosis - Describes a category of mental disorders characterized by feelings of anxiety, distress, or obsession, but without a loss of reality.

The suffix -osis helps to form nouns that describe various conditions, particularly in the medical field, by implying an abnormal state or a diseased process associated with the root word.