What does conjunctivitis mean?
Conjunctivitis is inflammation of the conjunctiva, the thin, transparent membrane that lines the inside of the eyelids and covers the white of the eye. When this membrane becomes irritated or infected, the eye turns red and watery, often accompanied by itching, swelling, and a discharge that can make the eyelids stick together. Common causes include viral or bacterial infection, allergies, and environmental irritants such as smoke or chlorine. The condition is widely known by its informal name, pinkeye, particularly in reference to the highly contagious forms that spread readily among children in schools and nurseries. Although uncomfortable and unsightly, most cases are mild and resolve on their own or with simple treatment, though bacterial infections may require antibiotic drops. The term derives from Latin roots meaning 'to join together,' reflecting how the conjunctiva joins the eyeball to the inner eyelid.
nounInflammation of the conjunctiva, the delicate membrane lining the eyelid and covering the white of the eye, typically causing redness, itching, and discharge. It is commonly known as pinkeye.
- Inflammation of the conjunctiva of the eye, causing redness, irritation, and discharge; commonly called pinkeye.
"The nursery sent a note home warning parents that several children had been diagnosed with conjunctivitis."
"She was sent home from school with a mild case of conjunctivitis and instructions to keep her hands away from her eyes."
"Allergic conjunctivitis flared up every spring when the pollen count peaked."
A rare Latinate plural occasionally seen in specialist medical writing when referring to multiple distinct cases or types; 'cases of conjunctivitis' is far more common in ordinary usage.
"The clinic reported several conjunctivitides across different wards that week."
'Pinkeye' sounds like a playground nuisance, but this little Latin-built word has been making eyes red since the era of Latin medical texts — and it's one of the most contagious words in the schoolyard lexicon.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of conjunctivitis
Conjunctivitis comes from New Latin, formed from 'conjunctiva' (the anatomical term for the membrane) combined with the suffix '-itis,' which denotes inflammation. The root traces back to Latin 'coniungere,' meaning 'to join together,' so named because the conjunctiva joins the eyeball to the inner surface of the eyelid. The same Latin root gives English words such as 'conjunction' and 'conjunctive.' The suffix '-itis' itself derives from Greek and became standard in medical terminology through Latin and New Latin usage.
How conjunctivitis is actually used
A medical term used in both clinical and everyday contexts. In casual speech, 'pinkeye' is the more common informal equivalent, especially for the contagious childhood form. The word is uncountable in general use ('a case of conjunctivitis'), though specific instances may be referred to individually.
Easily confused with conjunctivitis
The conjunctiva is the membrane itself, while conjunctivitis is the inflammation of that membrane.