Orthokeratosis
/ˌɔːrθoʊˌkɛrəˈtoʊsɪs/noun
The normal formation and maturation of keratin in the outer layer of the skin.
Did you know?The keratin in skin, hair, nails, claws, feathers, and horns belongs to the same broad biological material family, making the ancient “horn” metaphor remarkably precise.
Etymological Timeline
Proto-Indo-European
PIE
*h₃reǵ-
“To straighten, direct, or make right; the distant root behind the Greek element orthos.”
Proto-Indo-European
PIE
*ker-
“Horn or head; a root referring to horn-like or pointed structures and ancestral to the Greek element kerat-.”
Ancient Greek
Greek
orthós
“Straight, upright, correct, or proper.”
Ancient Greek
Greek
kéras / kératos
“Horn; the combining stem kerat-.”
Hellenistic and Medical Greek
Greek
orthokeratōsis
“Formation of normally keratinized, horn-like outer tissue; built from orthos, keras, and -osis.”
20th Century
Medical English
orthokeratosis
“A dermatological term for normal keratinization, especially the presence of a normal granular layer in the epidermis.”