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Douglas Harper's Etymology Dictionary
decaffeinate

1909 (implied in decaffeinated), from de- + caffeine + -ate (2).

Wiktionary
decaffeinate

vb. (context transitive English) To remove the caffeine from something (especially from coffee).

Usage examples of "decaffeinate".

She pushed through the brass-decorated double doors and entered a sitting room with sofas, coffe table, television and a sideboard containing herbal teas, decaffeinated coffe and a frosty pitcher of ic water filled with lemon slics.

Mackintosh's decaffeinated coffee, now sporting a skin, is still on the table.

Usually, she drank decaffeinated diet soda, but this was the real stuff, chock full of sugar and caffeine.

I take a bran muffin, a decaffeinated herbal tea bag and a box of oat‑bran cereal from one of the large glass‑front cabinets that make up most of an entire wall in the kitchen.

Next to the Salton Sonata toaster and the Cuisinart Little Pro food processor and the Acme Supreme Juicerator and the Cordially Yours liqueur maker stands the heavy‑gauge stainless-steel two‑and‑one‑half‑quart teakettle, which whistles "Tea for Two" when the water is boiling, and with it I make another small cup of the decaffeinated apple‑cinnamon tea.

I told him that I'd double-checked at the time, and slept badly, though I think that may have had more to do with the fact that I wasn't drinking decaffeinated during the corrections.

Next, when he was sitting comfortably, cup of decaffeinated in hand, I told him the full story.

She poured water onto instant decaffeinated coffee granules in each of two mugs.

The way you feel when you're scrubbing with pure ammonia fumes and right then while you're scrubbing chicken skin off the barbecue grill, every stupid thing in the world, decaffeinated coffee, alcohol, free beer, StairMasters, makes perfect sense, not because you're any smarter, but because the smart part of your brain's on vacation.

Elissa, there's some decaffeinated coffee you can reheat, and some of that cake I made.

I put on a pot of decaffeinated coffee and carried two mugs down the hall.

When she first came to the office, he insisted on decaffeinated coffee.

The supply of hors d'oeuvres had dwindled to a few selections that nobody wanted, and the champagne had been abandoned in favor of decaffeinated coffee, but the talking was louder and more animated than before, and frequently punctuated with laughter.

We were sitting at the butcher block table drinking decaffeinated coffee when Carli descended the dark staircase and walked into the downstairs light.

Just sitting there, brooding, with that damn gun out on the table, drinking decaffeinated coffee and waiting for Abe Glitsky to call him.