1. Plural of pumpjack; mechanical devices that extract crude oil from oil wells by using a rocking motion to operate a pump.
Usage: Common in oil and gas industry; Also called nodding donkeys or horsehead pumps

Examples

• The oil field was dotted with dozens of pumpjacks working day and night.
• Pumpjacks are a familiar sight in Texas and Oklahoma.
• The rhythmic motion of the pumpjacks could be heard across the prairie.
• Modern pumpjacks are more efficient than older models.
• The company installed new pumpjacks to increase production at the well.