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WORDNET DICTIONARY
Noun jackhammer has 1 sense
- jackhammer(n = noun.artifact) air hammer, pneumatic hammer - a hammer driven by compressed air; is a kind of hammer, power hammer
CIDE DICTIONARY
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. [WordNet 1.5]