oilhole
/ˈɔɪlˌhoʊl/
noun
- A small opening or hole through which oil is poured or injected, especially in machinery or engines.
- He used a small funnel to reach the oilhole on the old sewing machine.
- Make sure the oilhole is clean before adding any new oil to the machine.
- The mechanic poured lubricant into the oilhole on the side of the motor.