What does ichthyosis mean?
Ichthyosis is a medical term for a group of inherited skin disorders in which the skin produces too much keratin, leading to dryness, thickening, and persistent scale-like flakes. The name comes from Greek, through the combining form ichthyo-, meaning “fish,” referring to the appearance of severe scaling. Ichthyosis is not simply ordinary dry skin: it is usually a persistent, genetically influenced condition that may affect large areas of the body and can cause itching, discomfort, and complications involving temperature regulation or eye closure. Forms include ichthyosis vulgaris, congenital ichthyosis, and lamellar ichthyosis. Diagnosis usually involves examination of the skin and sometimes genetic testing, while treatment focuses on moisturizing the skin, removing scales, relieving symptoms, and preventing infection. The word is chiefly used in medical and educational settings.
nounA group of inherited skin disorders characterized by excessive keratin buildup, dry thickened skin, and scale-like patches. The term also refers to the characteristic scaling and may be used more broadly for severe dry-skin conditions resembling fish scales.
- Any of a group of inherited keratinization disorders characterized by dry, thickened, scaly skin.
- The abnormal scaling or fish-scale-like appearance of the skin associated with these disorders.
"The diagnosis of ichthyosis explained the patient's persistent dry, scaly skin."
"Ichthyosis is a genetic condition that can cause widespread scaling and itching."
"The dermatologist explained that the patient's ichthyosis was a mild, inherited form."
The plural is uncommon in general writing but is used when referring to different types or cases of the condition.
"The article compares several forms of ichthyoses and their genetic causes."
Ichthyosis takes its name from the Greek word for fish, a reference to the scale-like appearance of affected skin.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does ichthyosis come from?
Ichthyosis combines the combining form ichthyo-, from Greek ikhthys, “fish,” with -osis, a suffix used in medicine to indicate a condition or abnormal condition. The reference to fish reflects the characteristic scale-like appearance of the skin. Related English words include ichthyology, the study of fish, and ichthyosaur, an extinct marine reptile; both preserve the same Greek root for fish.
How ichthyosis is actually used
This is primarily a medical term. It is usually used in clinical or educational contexts and should not be used to describe ordinary dry skin. The condition has many inherited forms, each with distinct genetic and clinical features.
Easily confused with ichthyosis
Xerosis is the general medical term for unusually dry skin, whereas ichthyosis refers to a group of inherited disorders marked by abnormal scaling and thickened skin.