
1) Architectural element 2) Curved bench 3) Curved high-back bench 4) Folly building 5) Greek stone seat for several 6) Semicircular bench 7) Semicircular high-back bench 8) Semicircular seat in a park 
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https://www.crosswordclues.com/clue/exedra

 In architecture, an exedra is a semicircular recess or plinth, often crowned by a semi-dome, which is sometimes set into a building`s facade. The original Greek sense (ἐξέδρα, a seat out of doors) was applied to a room that opened onto a stoa, ringed with curved high-backed stone benches, a suitable place for a philosophical conversation. ....
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http://en.wikipedia.org/wiki/Exedra

an open or colonnaded recess, intended for conversation, often semi-circular, and furnished with seats or a long bench. 
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http://faculty.bsc.edu/jtatter/glossary.html

semicircular bench beside episcopal throne; outdoor bench or recess
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http://phrontistery.info/e.html

• (n.) Any out-of-door seat in stone, large enough for several persons; esp., one of curved form. • (n.) The projection of any part of a building in a rounded form. • (n.) A room in a public building, furnished with seats.
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http://thinkexist.com/dictionary/meaning/exedra/

in architecture, semicircular or rectangular niche with a raised seat; more loosely applied, the term also refers to the apse (q.v.) of a church or ...
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http://www.britannica.com/eb/a-z/e/58

In architecture, an open recess such as a niche containing a seat, and usually curved in plan. ...
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http://www.encyclo.co.uk/local/20688

Wall alcove with bench space  
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http://www.encyclo.co.uk/local/22203

Any architectural element that opened off and onto a usually larger element. They took the form of a semi-circular or rectangular recess with an open front, and often had seats or benches. In Roman bath houses, exedrae were often open rooms off the palaestra, used for rest and relaxation and also for philosophical debates and other educational purp…...
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http://www.encyclo.co.uk/visitor-contributions.php

Ex'e·dra (ĕks'e*drȧ)  noun ;  plural  Exedræ (- drē). [ Latin , from Gr  'exe`dra ;  'ex out +  'e`dra seat.]  1.  (Class. Antiq.) A room in a public building, furnished with seats.   2.  (Architecture) 
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http://www.encyclo.co.uk/webster/E/85

In architecture an exedra is the projection of any part of a building in a rounded form or any out- of-door seat in stone, large enough for several persons; especially one of a curved form.
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http://www.probertencyclopaedia.com/browse/TE.HTM

See apse. 
Found on 
http://www.virtualani.org/glossary/index.htm

a semicircular portico with curved outdoor high-backed benches that was often used in ancient Greek and Roman times as meeting area.
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https://www.encyclo.co.uk/local/10135

Rooms off the palaestra used for relaxation
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https://www.encyclo.co.uk/local/21777

(in ancient Greece and Rome) a room or covered area open on one side, used as a meeting place. · a permanent outdoor bench, semicircular in plan and having a high back.
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https://www.infoplease.com/dictionary/exedra
  No exact match found.