Ob·serv·a·to·ry n.; pl. Observatories
1. A place or building for making observations on the heavenly bodies.
The new observatory in Greenwich Park. --Evelyn.
2. A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena.
3. A place, as an elevated chamber, from which a view may be observed or commanded.
4. Mil. A lookout on a flank of a battery whence an officer can note the range and effect of the fire; usually referred to as an observation post.
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observation post
n : an elevated post affording a wide view [syn: lookout]