Let down reflex
An involuntary reflex during the period of time when a women is breastfeeding which causes the milk to flow freely.
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- Lesion
An area of abnormal tissue change. Lesions vary in severity from harmless to serious.
- Lethal gene, zygotic
A gene that is fatal for the zygote, the cell formed by the union of a sperm and an egg. The zygote would normally develop into an embryo, as instructed by the genetic material within the unified cell. However, a zygotic lethal gene kills prenatal development at its earliest point. A zygotic lethal gene is […]
- Lethargy
Abnormal drowsiness, stupor.
- Letrozole
Aromatase inhibitor; monograph on Femara (letrozole).
- Leucemia
A different spelling of leukemia, cancer of the blood cells. The growth and development of the blood cells are abnormal. Strictly speaking, leukemia should refer only to cancer of the white blood cells (the leukocytes) but in practice it can apply to malignancy of any cellular element in the blood or bone marrow, as in […]