In medical terminology, "asymmetrical" means:

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The term "asymmetrical" in medical terminology refers to a condition where something is not equal on both sides. This can relate to various medical contexts, such as the size of body parts, organ development, or even symptoms of a condition. When a body is described as asymmetrical, it indicates that one side differs from the other, which can be significant in diagnosing certain medical conditions or assessing physical anomalies.

Understanding this term is crucial in the medical field, as many conditions may present with asymmetry—such as growths, swelling, or muscular development—indicating a need for further examination or treatment. The context in which asymmetry is observed can provide valuable insights into underlying health issues.

Other options like equal size, proportional, or even distribution do not convey the meaning of asymmetry, which specifically denotes a lack of equality or balance between sides. Hence, "not equal on both sides" accurately captures the essence of asymmetry in medical terminology.