Anything thrown or propelled in any way can quite properly be described as "a missile". Bullets and shells are missiles, as are stones, for that matter.

As for Depleted Uranium - it's not a question of "may be a health hazard if ingested". If ingested the particles are a definite health hazard, and they contaminate an environment for a long time.

An attempt is in UN to ban the use of Depleted Uranium was defeated by the USA, the UK and France. It's being used in Libya "to protect civilians".