GNU Collaborative International Dictionary of English
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Found one definition
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highball (hīˈba̤lˌ), n.
1. An alcoholic beverage having a liquor such as whiskey mixed with water or a carbonated beverage, and usually served with ice in a tall glass. [wns=1]
[WordNet 1.5]
2. (Railroads) A railroad track signal permitting the engineer to proceed at full speed.
[PJC]