An enlargement, increased development: Judy learned that an hypertroph referred to a part of an organism that grew immoderately because of an unusual increase of cells.

The condition of an abnormal enlargement of an organ or body part: Hypertrophy can occur because of an increase in cell size rather than cell numbers.

Hypertrophy is normally the situation of an increase in bulk of a part or organ, not due to tumor formation.

Use of the term may be restricted to denote greater bulk through increase in size, but not in number, of the individual tissue element, such as the enlargement of muscles as a result of exercise.