Ob‐serv″a‐to‐ry (?), n.; pl.Observatories (#). [Cf. F. observatoire.] 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. Farrow.