01 n. A place or building for making observations on the heavenly bodies.
pl.
Observatories ((#))
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1.
A place or building for making observations on the heavenly bodies.“The new observatory in Greenwich Park.” — Evelyn.
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2.
A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena.
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3.
A place, as an elevated chamber, from which a view may be observed or commanded.
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4.
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.(Mil.) Also: observation post