score:19

Accepted answer

you can use lang options and set empty string.

highcharts.setoptions({
        lang:{
            rangeselectorzoom: ''
        }
});

http://jsfiddle.net/q0ra5tk6/

score:10

the rangeselectorzoom property as suggested by sebastian is not present in 6.1.0 anymore. a work around if you don't need the from and to inputs, as it was my case is to not show the label at all:

rangeselector: {
  labelstyle: {
     display: 'none'
  }
}

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