|1.||the end joint or tip of a finger|
|2.||another term for fingerstall|
|3.||at one's fingertips readily available and within one's mental grasp|
fingertip fin·ger·tip (fĭng'gər-tĭp')
The extreme end or tip of a finger.
at one's fingertips
Ready at hand, immediately available. This idiom is used both literally, as in This new dashboard design keeps all the important controls at the driver's fingertips, and figuratively, as in Tom was so familiar with the proposal that he had all the details at his fingertips. [Second half of 1800s]