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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