What term describes an organ or part of the body that is not symmetrical?

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The term that describes an organ or part of the body that is not symmetrical is "asymmetrical." In biological terms, symmetry typically refers to the balanced distribution of duplicate body parts or shapes within the body. When an organ or part is asymmetrical, it means there is a lack of that balance, resulting in one side being different from the other in size, shape, or position.

The other terms provided do not accurately describe this concept. For example, "symmetrical" refers to a state of balance and evenness, which is the opposite of the condition being described. "Homogeneous" relates to uniformity and a consistent composition throughout a substance, while "equilateral" specifically pertains to geometric shapes having all sides equal, which is not applicable to biological structures. Thus, "asymmetrical" is the correct choice for identifying organs or parts of the body that lack symmetry.