pro·jec·tile
noun/prəˈdʒektaɪl/
/prəˈdʒektl/
(formal or specialist)- an object, such as a bullet, that is fired from a gun or other weapon
射弹（如子弹、炮弹等） - any object that is thrown as a weapon
（作为武器的）发射物；导弹
Word Originmid 17th cent.: modern Latin, from project- ‘thrown forth’, from the verb proicere ‘throw forth’, from pro- ‘forth’ + jacere ‘to throw’.