What's the noun for stoppable? Here's the word you're looking for.
stop
(engineering) A device, or piece, as a pin, block, pawl, etc., for arresting or limiting motion, or for determining the position to which another part shall be brought.
(architecture) A member, plain or moulded, formed of a separate piece and fixed to a jamb, against which a door or window shuts.
A device intended to block the path of a moving object
(engineering) A device, or piece, as a pin, block, pawl, etc., for arresting or limiting motion, or for determining the position to which another part shall be brought.
(architecture) A member, plain or moulded, formed of a separate piece and fixed to a jamb, against which a door or window shuts.
The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.