The definition of a zerk is a fitting often found on a wheel to allow lubrication.
An example of a zerk is a grease fitting usually found on a wheel.
a small metal fitting through which grease can be inserted into a mechanical joint that requires periodic lubrication
Origin of zerkafter O. Zerk (1878-1968), United States inventor, born in Austria
- A type of grease fitting.
After Austrian-born American inventor Oscar U. Zerk.