line of sight
- A straight line along which an observer has a clear view.
- (weaponry) The line which passes through the front and rear sight, at any elevation, when they are sighted at an object.
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for line of sight in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)