Definition of "thinned" []

• Simple past tense and past participle of thin. (verb)

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• "Second winter my blood had thinned from the altitude and boy what a difference."
• "As the rain thinned, so that the crackle of it on deck became less noisy, he was attracted by a sound from out over the water."
• "Thus if lots of fossil fuels are burned, the “normal” ratio of 13C/12C will be thinned, which is what is observed."