(firearms) A kind of lock for a gun in which a hammer strikes upon a percussion cap on the nipple, igniting the charge.

An iron shoe placed on the rear wheel of a wagon to retard motion in going downhill.

plural of wagon lock

plural of num lock

The loss of one degree of freedom in the three-dimensional rotational movement of a three-gimbal mechanism, which occurs when the axes of two of the three gimbals are driven into a parallel configuration, so that the system's rotational movement becomes two-dimensional (and necessarily remains so until an appropriate force is applied); the equivalent situation in a simulation of rotational movement, when the mathematical model uses Euler angles (representing pitch, yaw and roll) or their equivalent.

plural of gimbal lock

plural of seat lock

(railways) The lock of a reversible seat in railroad cars.

simple past tense and past participle of lip lock

simple past tense and past participle of lip-lock