Chrome on Android has a built-in Google Search function.

Originally shared by Craig Froehle

Chrome on Android has a built-in Google Search function. Tap and select a word or phrase, and a blue Google ‘g’ circle appears on the bottom of the screen. Tap that circle and up comes a quick Google Search on that word or phrase, overlaid on top of your webpage so you don’t have to leave whatever it is you’re reading. Nifty!