Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Defective sight in which objects cannot be properly seen if not close to the centre of the field of view.
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
