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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 wired and attached to a telephone line. See transceiver and bridged tap.

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

(3) To press a key on a keypad.

(4) (Amazon TAP) See Amazon Echo.

(5) (TAP) (Telocator Alphanumeric Protocol) A paging protocol used to transmit up to a thousand 7-bit characters to an alphanumeric pager. Developed in the early 1980s by the Telocator Paging Association, which later became the Personal Communications Industry Association (PCIA), TAP was also known as IXO and PET. TAP is widely used in the U.S. and throughout Europe.
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.
Gradually in the 1970s rubber tappers throughout the Amazon began formulating regional development plans designed to meet the needs of the 2 million to 3 million forest workers.
Tapathon organiser Janet Austin (centre) with her Janet Austin Tappers at last year's event.
As a child, Allen studied dance and music at the Elma Lewis School in Roxbury and tap with Stanley Brown, which connects her son directly into the rich Boston lineage of African American artists and tappers, including Jimmy Slyde, Dianne Walker, and the late Leon Collins.
For details on the reunion or about joining the Tappers phone 01484 712217.
Often, the serious rhythm tapper has a limited background in other dance forms.
The Tapathon raises money for the Roy Castle Lung Foundation, and each of the Newsome Tappers are being sponsored for their toe tapping tournament.
Jason Samuels Smith notes that tappers must perform on a variety of surfaces.
teamwork Members of the Janet Austin Tappers of Brighouse
The best tappers are the most well-rounded--they can hoof, do Broadway, anything.
getting ready The Newsome Tappers prepare for last year's Tapathon and Scholes-born entertainer Roy Castle (left)
But tap is proliferating, largely owing to the bootstrap efforts of tappers across the country and now abroad as well.