
1) Building 2) Edifice 3) French word used in English
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https://www.crosswordclues.com/clue/observatory

An observatory is a location used for observing terrestrial or celestial events. Astronomy, climatology/meteorology, geology, oceanography and volcanology are examples of disciplines for which observatories have been constructed. Historically, observatories were as simple as containing an astronomical sextant (for measuring the distance between st...
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http://en.wikipedia.org/wiki/Observatory
[horse] Observatory is a thoroughbred race horse. He won the Queen Elizabeth II Stakes at Ascot, and the Prix d`Ispahan in France. ...
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http://en.wikipedia.org/wiki/Observatory_(horse)

• (n.) A place or building for making observations on the heavenly bodies. • (n.) A lookout on a flank of a battery whence an officer can note the range and effect of the fire. • (n.) A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena. • (n.) A place, as a...
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http://thinkexist.com/dictionary/meaning/observatory/

Place where the stars and planets of the solar system can be observed. Examples include that at Westerton, County Durham and Sharpe's Folly, Whitton, Northumberland of the 18th century AD.
Found on
http://www.encyclo.co.uk/local/20766
Ob·serv'a·to·ry noun ;
plural Observatories . [ Confer French
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 instrum...
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http://www.encyclo.co.uk/webster/O/5

A place where people look into space.
Found on
http://www.solarspace.co.uk/Glossary3.php

[
n] - a building designed and equipped to observe astronomical phenomena
Found on
http://www.webdictionary.co.uk/definition.php?query=observatory

a place where scientists study volcanoes
Found on
https://sciencetrek.org/sciencetrek/topics/volcanoes/glossary.cfm
noun a building designed and equipped to observe astronomical phenomena
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https://www.encyclo.co.uk/local/20974

Site or facility for observing astronomical or meteorological phenomena. The modern observatory dates from the invention of the telescope. Observatories may be ground-based, carried on aircraft, or sent into orbit as satellites, in space stations, and on the space shuttle. The pre-telescopic observatory built on the island of Hven (now Ven)...
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https://www.encyclo.co.uk/local/21221

Traditionally thought to have been located briefly in the north-east Tower of the White Tower where John Flamsteed took astronomical observations in 1675
Found on
https://www.encyclo.co.uk/local/22686
No exact match found.