The medical study of glands, their structure, function, and diseases.
From Greek adeno- 'gland' + -logy 'study of' (from logos 'word, reason'). A specialized medical field that emerged in the 19th century as glands became better understood.
Adenology seems like a narrow specialty, but it led to major discoveries about hormones, immunity, and metabolism—basically, understanding glands meant understanding how our bodies regulate almost everything!
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