der Körperteil
body part
An individual, clearly distinguishable part of the human or animal body.
Das Knie ist ein komplexer Körperteil, der im Alltag stark beansprucht wird.
The knee is a complex body part that is heavily used in everyday life.

body part
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body part
An individual, clearly distinguishable part of the human or animal body.
Das Knie ist ein komplexer Körperteil, der im Alltag stark beansprucht wird.
The knee is a complex body part that is heavily used in everyday life.

This word is a simple compound made up of 'der Körper' (body) and 'der Teil' (part). So it literally means exactly that: a part of the body.
Der Arm ist ein wichtiger Körperteil für viele tägliche Aktivitäten.
The arm is an important body part for many daily activities.
'Körperteil' (body part) is a general umbrella term. It is often used when you don't know the specific name, don't want to mention it, or are asking about it.
Welcher Körperteil ist von der Verletzung betroffen?
Which body part is affected by the injury?
Common verbs used with 'Körperteil' (body part) are 'bewegen' (to move), 'verletzen' (to injure), 'trainieren' (to train), or 'untersuchen' (to examine). It also often appears with adjectives like 'einzeln' (individual) or 'bestimmt' (specific).
Beim Yoga lernt man, einzelne Körperteile bewusst zu spüren.
In yoga, you learn to consciously feel individual body parts.
organ
'das Organ' and 'der Körperteil' both belong to the topic of the body. They can be confused because an organ is also a part of the body. However, 'das Organ' means a specific internal or external part with a particular function, for example the heart, lungs, or skin. 'der Körperteil' is more general and can also mean an arm, leg, head, or finger. When it is about medical function, 'Organ' is more precise. When you are simply naming a visible or clearly distinguishable part of the body, 'Körperteil' fits better.

Nach dem Unfall tat ihm fast jeder Körperteil weh.
After the accident, almost every part of his body hurt.
Das Herz ist ein wichtiges Organ, weil es Blut durch den Körper pumpt.
The heart is an important organ because it pumps blood through the body.