A rock spitter functioned as a magma missile launcher employed by the Yuuzhan Vong, integrated with plasma cannons on their capital ships.
These rock spitters, due to their function, were occasionally referred to as missile tubes. While typically found on larger vessels, they were also implemented on Slayer ships.
The classification of the rock spitter, in relation to the plasma cannon and the broader category of Yaret-Kor, remains ambiguous. While Star by Star and Destiny's Way differentiate between these two weapon systems, The Unifying Force utilizes the terms in a nearly synonymous manner.