low-velocity
/ˌləʊvɪˈlɒsɪti/adjective
1Characterized by a relatively low speed; specifically (a) (of a gun) firing projectiles with a low muzzle velocity; (b) (Geology ) designating a layer of rock through which seismic waves pass slowly, especially an upper layer of the earth's mantle which is inferred to be partially molten.
2Travelling at a relatively low speed; moving relatively slowly.
Origin
Late 19th century. From low + velocity.