fingertip

[fing-ger-tip] /ˈfɪŋ gərˌtɪp/
noun
1.
the tip or end of a finger.
2.
a covering used to protect the end joint of a finger.
adjective
3.
extending to the fingertips, as a coat, veil, etc.:
a fingertip jacket.
Idioms
4.
at one's fingertips,
  1. close at hand; easily or immediately available.
  2. at one's command or disposal, as recall of factual information:
    He has the answer at his fingertips.
5.
to one's fingertips, thoroughly; perfectly:
She was a politician to her fingertips.
Origin
1835-45; finger + tip1
British Dictionary definitions for at one's fingertips

fingertip

/ˈfɪŋɡəˌtɪp/
noun
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
Word Origin and History for at one's fingertips

fingertip

n.

1824, from finger (n.) + tip (n.). Related: Fingertips.

at one's fingertips in Medicine

fingertip fin·ger·tip (fĭng'gər-tĭp')
n.
The extreme end or tip of a finger.

Idioms and Phrases with at one's fingertips

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 ]