Wide″–an′gle, a.(Photog. & Optics) Having or covering an angle wider than the ordinary; — applied to certain lenses of relatively short focus. Lenses for ordinary purposes have an angle of 50° or less. Wide-angle lenses may cover as much as 100° and are useful for photographing at short range, but the pictures appear distorted.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.