'jackhammer' definitions:

Definition of 'jackhammer'

(from WordNet)

noun

A hammer driven by compressed air [syn: air hammer, jackhammer, pneumatic hammer]

Definition of 'jackhammer'

From: GCIDE

jackhammer \jackhammer\ n. a hammer having a strong steel cutting blade, driven by compressed air in multiple rapid strokes, and used for cutting through pavement, concrete, or other hard substances.
Syn: air hammer, pneumatic hammer. [WordNet 1.5]

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