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lock

A cylinder lock's tumbler consists of a series of pins arranged in pairs. The pins are …

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Mechanical or electronic device for securing a door or receptacle so that it cannot be opened except by a key or a code. The lock originated in the Middle East; the oldest known example was found near Nineveh. Possibly 4,000 years old, it is of the pin tumbler type, otherwise known as an Egyptian lock. The Romans were the first to use metal locks and to make small keys for them. They also invented wards, projections in the keyhole that prevent a key from turning unless it has slots that avoid the projections. Probably the most familiar lock today is the cylinder lock, a pin tumbler lock opened by a flat key with a serrated edge; the serrations raise pins in the cylinder to the proper heights, allowing the cylinder to turn. Also common are the unit lock, housed within a rectangular notch cut into the edge of a door, and the mortise lock, housed in a mortise cut into the door edge, the lock mechanism being covered on both sides. Other types include lever and combination locks. Electronic locks that open with a magnetic card key are popular for banks, hotel rooms, and offices.

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lock

1. a device fitted to a gate, door, drawer, lid, etc., to keep it firmly closed and often to prevent access by unauthorized persons

2. a similar device attached to a machine, vehicle, etc., to prevent use by unauthorized persons

3. 

a. a section of a canal or river that may be closed off by gates to control the water level and the raising and lowering of vessels that pass through it

b. (as modifier): a lock gate

4. Brit the extent to which a vehicle's front wheels will turn to the right or left

5. any wrestling hold in which a wrestler seizes a part of his opponent's body and twists it or otherwise exerts pressure upon it

6. Rugby either of two players who make up the second line of the scrum and apply weight to the forwards in the front line

7. a gas bubble in a hydraulic system or a liquid bubble in a pneumatic system that stops or interferes with the fluid flow in a pipe, capillary, etc.