projectile

n. 发射体,抛射物
a. 发射的,投射的

A whistling sound, as of an animal or a projectile.

啭鸣声尖厉高音，如动物或发射物而发出的声音

Such a projectile in a metal casing; a cartridge.

弹药（筒）装在金属盒中的射弹。弹药