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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



(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.


(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.


1. A connection to a water supply main.
2. A faucet.
3. A tool used for cutting internal threads, as in a pipe.






(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.
References in periodicals archive ?
The length of service is truncated because rubber tappers who leave one estate and later join another will not have their service from the previous estate counted as service in the new estate, even though both estates may belong to the same company.
Yet Mendes, a lifelong rubber tapper and labor union activist, considered his struggle to be founded not on ecology but on social justice and human rights.
The rubber tappers had gathered from Acre, nestled beside the Andes; from Amapa, bordering the Atlantic Ocean 2,000 miles to the east.
The Janet Austin Tappers, Donna Claire School of Dance and Strickland-Cook Tappers are amongst the Huddersfield groups taking part in the event at Northridge Leisure Centre in Halifax, along with those from the town, Brighouse and Bradford.
The Janet Austin Tappers perform during the afternoon session and (right) |young dancers from Whiteley's Dance Academy perform
Last fall Brooks led a group of young tappers from Boston in the Overture Productions concert version of On the Twentieth Century, the 1978 musical by Cy Coleman, Betty Comden, and Adolph Green.
The Janet Austin Tappers will hold a reunion celebration at the Auctioneer Restaurant, Brighouse, on Friday October 17.
Lane Alexander of Chicago Human Rhythm Project interviewed Weber about his simple, yet demanding, approach to training tappers.
SPARKLING SHOW: (Above) The Huddersfield-based Pam Strickland Tappers and (left) the Newsome Tappers at the grand annual Tapathon in Halifax.
A herd of thundering tappers stamps across the floor at Debbie en Dance Academy in Culver City, California.
THE Newsome Tappers are getting in final rehearsals for the 2008 Roy Castle Tapathon.
As tappers, both siblings possess an air of easy elegance, with dazzling pyrotechnic footwork always at the ready.