One of the mysteries of the English language finally explained.
1Abnormally small size of the body (dwarfism); (in full "microsomia fetalis") abnormally small size of the fetus for gestational age. Compare macrosomiarare. Perhaps Obsolete.
2With distinguishing word: underdevelopment of part of the face, as a congenital malformation.
Mid 19th century. From Italian microsomia from micro- + ancient Greek σῶμα body + -ia.
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