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1. a particular quality of alcoholic drink, esp when contained in casks
2. the surgical withdrawal of fluid from a bodily cavity
3. a tool for cutting female screw threads, consisting of a threaded steel cylinder with longitudinal grooves forming cutting edges
4. Electronics chiefly US and Canadian a connection made at some point between the end terminals of an inductor, resistor, or some other component
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(Screw Tap), a tool for cutting a screw thread in a previously drilled hole. A tap is a cylindrical spindle with cutting edges at one end. The other end, or shank, is designed to be fastened in a chuck or held in a tap wrench while being turned.

The main types of taps are manual taps; inside taps, for cutting a complete thread in through holes in one traverse; machine taps, for cutting threads mainly in blind holes on drilling machines, automatic machines, and special assembly-line units; machine-tool taps, for making threads in through holes on nut-tapping machines; grooveless taps, for cutting threads in through holes in one traverse; automatic taps, for cutting threads in nuts on automatic nut-tapping machines; and die and master taps, for cutting threads and thread gauges and removing the burrs in the threaded holes of circular dies. The materials used to make taps are alloy tool steel and high-speed steel.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(design engineering)
A plug of accurate thread, form, and dimensions on which cutting edges are formed; it is screwed into a hole to cut an internal thread.
A threaded cone-shaped fishing tool.
A connection made at some point other than the ends of a resistor or coil.
A small, threaded hole drilled into a pipe or process vessel; used as connection points for sampling devices, instruments, or controls.
A quantity of molten metal run out from a furnace at one time.
To remove excess slag from the floor of a pot furnace.
(mining engineering)
To intersect with a borehole and withdraw or drain the contained liquid, as water from a water-bearing formation or from underground workings.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. A connection to a water supply main.
2. A faucet.
3. A tool used for cutting internal threads, as in a pipe.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.




This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)


(1) In communications, a connecting point on a line. For example, a wire tap is where a recording device is attached to a telephone line. See transceiver and bridged tap.

(2) (Amazon TAP) An Amazon Echo device. See Amazon Echo.

(3) To lightly touch a touch-sensitive screen. See double tap for more details.

(4) To press a key on a keypad.

(6) (TAP) (Telocator Alphanumeric Input Protocol) A protocol for transmitting text to a pager. Developed in the early 1980s, TAP was known as the Motorola Page Entry (PET) and IXO protocols and was adopted by Telocator, which later became the Personal Communications Industry Association (PCIA),

(5) To place a chip-based credit card near a terminal. See NFC and EMV.

The Chip Card Logo
This payment terminal screen shows a credit card being tapped to make a payment via NFC contactless communications.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
You should have heard a difference between the sound produced by the empty versus the paper-filled soda bottle, When you tapped on the paper-filled bottle, the paper absorbed some of the sound waves before the waves bounced back to your ears.
The use of TiAlN has increased the tool life by 1.35 times taking into considerations the number of holes tapped.
For 21 Below!, Williams tapped Buster Brown's signature tune, "Cute," by Neil Hefti.
One, keeping the spindle infeed fully synchronous with its rotational speed, or rpm, to the bottom of the tapped thread depth, which is the equivalent to exactly mating the machine speed to the thread pitch produced by the selected tap.
They tapped together in high school events and at local functions held at Miles College.
Many factors must be considered in selecting the right tap and tapholding devices, including the method of tapping (manual or machine), the material to be tapped (heat treatment), the length of thread or depth of the tapped hole, required tolerance or class of fit, as well as the production equipment being used.
Once, she tapped up and down the steps of the Washington Monument in an attention-getting "I Ain't A'Fred A'staires." Some might have thought her gimmicky, but Vaughn's tap pranks always made news and she was a serious student and teacher of tap.
With drills taking up 40% of the tool slots in machining centers and producing 60% of the resultant chips, a lot of holes are being created, and most end up tapped. Yet, tapping remains one of the most troublesome and complicated machining operations--complex geometries, chip flow, pitch diameters, adapters, reversing units, difficult gaging, etc;--too many variables that tend to get out of control.