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/ˈɹeɪl.ɡʌn/ · noun
An electromagnetic gun that uses a large electrical current to propel a projectile down a track of two parallel conductive rails..
Use rail gun when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Rail gun means An electromagnetic gun that uses a large electrical current to propel a projectile down a track of two parallel conductive rails..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use rail gun where its definition matches the intended context.
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