A review on the physiology of Insulin like Growth Factor-I (IGF-I) ... by Debnath, Surajit / Advances in Environmental Biology.
The spring piston airgun generates power using a powerful spring-loaded piston that is housed within a compression chamber. Cocking the gun (using a break barrel, side lever, or under lever mechanism) causes the piston assembly to compress the spring. When the spring is released it pushes the piston forward compressing a column of air in the chamber behind the pellet.
2. countable noun. A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. Unfortunately, as a standard mattress wears, the springs soften and so do not support your spine. Both springs in the fuel pump were broken.