
1) Ancient catapult 2) Ancient stone hurler 3) Ancient war engine 4) Arbalest 5) Arbalist 6) Artillery 7) Asian donkey 8) Asian jackass relative 9) Asian wild ass 10) Asian animal with a mane 11) Asian wild donkey 12) Ass or catapult 13) Ballista 14) Big catapult 15) Bricole 16) Catapult 17) Catapult of ancient warfare 
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https://www.crosswordclues.com/clue/onager

1) Arbalest 2) Arbalist 3) Ass 4) Ballista 5) Bricole 6) Chigetai 7) Dziggetai 8) Mangonel 9) Trebuchet 10) Trebucket 
Found on 
https://www.crosswordclues.com/clue/onager

 The onager (Equus hemionus) is a large member of the genus Equus of the family Equidae (horse family) native to the deserts of Syria, Iran, Pakistan, India, Israel (where it was reintroduced between 1982-1987), Central Asia, and Mongolia. The kiang (E. kiang), a Tibetan relative, was previously considered to be a subspecies of the onager as E. hem...
Found on 
http://en.wikipedia.org/wiki/Onager
 [siege weapon]
[siege weapon]  The onager was a Roman siege engine that is a type of ballista that uses a torsional force, generally from twisted rope, to store energy for the shot. The onager consisted of a large frame placed on the ground to whose front end a vertical frame of solid timber was rigidly fixed. A vertical spoke that passed through a rope bu...
Found on 
http://en.wikipedia.org/wiki/Onager_(siege_weapon)

Asiatic wild ass
Found on 
http://phrontistery.info/o.html

military engine for throwing great stones
Found on 
http://phrontistery.info/o.html

• (n.) A wild ass, especially the koulan. • (n.) A military engine acting like a sling, which threw stones from a bag or wooden bucket, and was operated by machinery.
Found on 
http://thinkexist.com/dictionary/meaning/onager/

(Equus hemionus onager), subspecies of the wild ass of Asia that ranged from northwest Iran to Turkmenistan. Pale-coloured and small, it has a short ... [2 related articles]
Found on 
http://www.britannica.com/eb/a-z/o/19

(from the article `military technology`) ...in the horizontal plane, such as that described above, are called ballistae. There is no evidence that catapults in the narrow sense were used by ...
Found on 
http://www.britannica.com/eb/a-z/o/19

Roman name for a Mangonel, literally a 'wild ass'
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http://www.encyclo.co.uk/visitor-contributions.php

From the 4th century AD onwards, this was the name of the siege engine, which used a torsion engine (tormentum) driving a vertical firing arm to hurl objects. It was named after the wild ass, because of the way it kicked out when it fired. It was a wheel-mounted siege engine with stones held in a sling ejected from the vertical arm powered by the t…...
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http://www.encyclo.co.uk/visitor-contributions.php

On'a·ger  noun ;  plural Latin  Onagri , English  Onagers . [ Latin  onager ,  onagrus , Greek ....]  1.  (Rom.Antiq.) A military engine acting like a sling, which threw stones from a bag or wooden bucket, and was operated by machinery.  Fairholt.
Found on 
http://www.encyclo.co.uk/webster/O/19

The Onager is a variety of the Asiatic wild ass (Equus hemionus), also called the ghorkhar, found in Western India and Baluchistan. It is pale in colour, has a broad dark stripe down the back, and is somewhat smaller than the kulan and is renowned for its speed.
Found on 
http://www.probertencyclopaedia.com/browse/BO.HTM

[
n] - Asiatic wild ass
Found on 
http://www.webdictionary.co.uk/definition.php?query=onager
 Equus hemionus noun
Equus hemionus noun Asiatic wild ass
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https://www.encyclo.co.uk/local/20974

Wild ass found in western Asia. Onagers are sandy brown, lighter underneath, and about the size of a small horse. (Species 
Equus hemionus.)
Found on 
https://www.encyclo.co.uk/local/21221
  No exact match found.