Thick, creamy drinks made by blending fruit, yogurt, milk, and sometimes vegetables into a smooth mixture.
From the adjective 'smooth' (without bumps or rough spots) plus the suffix '-ie' making it informal and friendly-sounding. 'Smooth' comes from Old English 'smōth.' The drink was named for its smooth texture.
Smoothies are a surprisingly recent invention! They didn't become mainstream until the 1990s when commercial blenders became powerful enough and when health culture shifted. Before that, milkshakes were it, but smoothies promised hidden vegetables—which is marketing genius because kids would actually drink their spinach.
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