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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: dermatology) baldness, absence of the hair from skin areas where it normally is present.

2. (Science: oncology) hair loss as a result of chemotherapy or radiation Therapy administered to the head. Hair loss from chemotherapy is temporary. Hair loss from radiation is usually permanent.

Origin: gr. Alepekia = a disease in which the hair falls out Loss of hair (especially on the head) or loss of wool or feathers; in humans it can result from heredity or hormonal imbalance or certain diseases or drugs and treatments (chemotherapy for cancer).Thought to be in response to stress, this condition can result in hair loss, sometimes as a result of medical treatment like chemotherapy.