The thin, clear membrane that covers the white part of the eye and lines the inner eyelid, keeping the eye moist and protected.
From Medieval Latin conjunctiva (membrana), meaning 'joining membrane,' because it joins and connects the eyeball to the eyelid. The term was coined by anatomists who recognized its role in connecting these structures.
The conjunctiva is literally named for what it does—it 'conjuncts' or joins the eyeball and eyelid together. Medical terminology often describes function through Latin, so when you have 'conjunctivitis,' it's inflammation of this joining membrane—the disease is named exactly for the affected structure.
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