One of the mysteries of the English language finally explained.
1Protection from view provided by trees, hedges, etc. Also as a count noun: something that provides protection from view.
2Material used as a screen against ionizing radiation, especially during radiotherapy; the efficiency of this, as determined by its nature and thickness.
Mid 19th century; earliest use found in John Galt (1779–1839), novelist. From screen + -age.
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