AMAURO'SIS, noun [Gr. obscure.] A loss or decay of sight, without any visible defect in the eye, except an immovable pupil; called also gutta serena. Sometimes the disease is periodical, coming on suddenly, continuing for hours or days, and then disappearing. It has sometimes been cured by electricity.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI