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1. A high-velocity gun with a caliber of 88 millimeters, used by German troops as an antiaircraft and antitank weapon during World War II.
2. An artillery shell, especially one fired by this gun.
3. Slang A piano.

[Sense 3, from the number of its keys.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.eighty-eight - being eight more than eightyeighty-eight - being eight more than eighty  
cardinal - being or denoting a numerical quantity but not order; "cardinal numbers"