There isn't a single answer to the question of what the strongest organ is, as "strength" can be defined in different ways. Strength can refer to sheer force, endurance, or resilience. Considering different measures of strength, several organs could be considered the strongest:
Strength as Force: The Masseter Muscle
Based on force per unit weight, the masseter muscle, the main muscle used for chewing, is often cited as the strongest muscle in the body. Working together with other jaw muscles, it can generate significant force for biting and chewing. Source: Library of Congress
Strength as Endurance: The Heart
The heart is the hardest working muscle in your body, constantly pumping blood throughout your entire life. Its remarkable endurance makes a strong case for it being the strongest organ. A healthy cardiovascular system is essential, requiring exercise, nutrition, rest, and protection from toxins. [Source: Various, including article from 06-Nov-2023].
Strength as Resilience/Durability: The Femur
The femur, or thighbone, is the longest and strongest bone in the body, able to withstand significant stress and impact. Its resilience makes it vital for supporting body weight and movement. Source: Cleveland Clinic
Strength as Sheer Size & Protection: The Skin
The skin is the largest organ in the body. While not a muscle, its tough and resilient nature, protecting the body from the outside world, could also be considered a form of strength. It's soft enough to allow movement yet tough enough to resist breaking or tearing. [Sources: USAToday, Better Health Channel, MedlinePlus](https://www.usatoday.com/story/news/health/2022/09/24/largest-organ-in-the-body/10380205002/, http://www.betterhealth.vic.gov.au/health/conditionsandtreatments/skin, https://medlineplus.gov/ency/imagepages/8912.htm)
In conclusion, defining the "strongest" organ depends on how you define strength.