the very end part of your finger, usually including the sensitive pad at the very top.
From Old English fingra (finger) combined with tip (the pointed end of something). The compound developed in English by simply joining the two common words to describe this specific body part.
Your fingertips contain about 100 touch receptors per square centimeter—more than anywhere else on your body—which is why they're so sensitive and why 'at your fingertips' became slang for information readily available to you.
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