Definition

1. Noun:
   • A wild ass native to Asia: The onager is a species of wild ass, specifically Equus hemionus, found in the deserts and steppes of Asia. It is known for its speed and endurance.
   • A type of ancient catapult: In historical military context, an onager was a Roman-era siege engine that used torsion to hurl heavy stones or other projectiles at fortifications.

Examples of Usage

• Noun (Animal):
  • The onager is well-adapted to the arid plains of Iran and Mongolia.
  • Conservation efforts are underway to protect the endangered onager.
• Noun (Siege Engine):
  • The Romans used the onager to breach city walls during a siege.
  • Reconstructing an accurate onager requires understanding of ancient engineering.

Advanced Usage

• The term is specialized. In zoology, "onager" refers specifically to the Asiatic wild ass. In military history, it refers to the specific torsion-powered catapult, distinguishing it from other siege engines like the ballista or trebuchet.

Variants and Related Words

• Onagers (n): The standard plural form for both meanings.
• Asiatic wild ass (n): A direct descriptive synonym for the animal.
• Catapult (n): A more general term for projectile-hurling siege engines, which includes the onager.
• Mangonel (n): A term sometimes used synonymously with or similarly to the onager for a stone-throwing siege engine.

Synonyms

• For the animal: Asiatic wild ass, kulan (a subspecies), khur (a subspecies).
• For the engine: Catapult, mangonel, stone-thrower.

Related Phrases

• None commonly used: "Onager" itself is a specific term and is not typically part of modern idioms or phrasal verbs.

Noun

1. Asiatic wild ass
2. an engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles