Main Entry: 1tool
Pronunciation: \ˈtül\
Function: noun
Etymology: Middle English, from Old English tōl; akin to Old English tawian to prepare for use — more at taw
Date: before 12th century
1 a : a handheld device that aids in accomplishing a task b (1) : the cutting or shaping part in a machine or machine tool (2) : a machine for shaping metal : machine tool
2 a : something (as an instrument or apparatus) used in performing an operation or necessary in the practice of a vocation or profession <a scholar's books are his tools> b : an element of a computer program (as a graphics application) that activates and controls a particular function <a drawing tool> c : a means to an end <a book's cover can be a marketing tool> d often vulgar : penis
3 : one that is used or manipulated by another
4 plural : natural ability <has all the tools to be a great pitcher>

cambridge on line

tool noun (EQUIPMENT)
/tuːl/ [C]
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a piece of equipment which you use with your hands to make or repair something
power tools
machine tools

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something that helps you to do a particular activity
A free low-interest credit card can be a useful budgeting tool.