Definition
"Atrophy" refers to the wasting away or shrinking of a body part or tissue. Think of it as a muscle getting smaller and weaker due to lack of use. It can occur due to various reasons such as lack of physical activity, malnutrition, or disease. It's the opposite of hypertrophy, which is the enlargement of tissues. Imagine a plant that isn't getting enough sunlight; it will wither and shrink.