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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 ?
TAPPER TIME: Newport Sea Anglers chairman Mark Wall presents Lewis Tapper, from Marshfield, with the multiplier reel he won for finishing fourth place in the Newport Sea Anglers Open Competition
Tappers Beer Battered Wings, the only beer-battered wings on the market, are sold to restaurants, pubs and taverns nationwide.
As well as a meal and a disco tappers will be able to enjoy a display of photos, past and present, plus memorabilia, facts and trivia from the group's history.
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.
DEJA SHOE's Brazilian supplier and the company responsible for initiating and expanding the ongoing program with rubber tappers and Indians to produce this traditional material.
In 1991, a total of 5,622 tappers gathered to claim the world title of the Largest Assembly of Tap Dancers to Dance in a Single Routine.
THE Newsome Tappers are getting in final rehearsals for the 2008 Roy Castle Tapathon.
Lane Alexander of Chicago Human Rhythm Project interviewed Weber about his simple, yet demanding, approach to training tappers.
smokin' guns Charlotte Paxman, Samantha Broadbent, Rosie O'Hare and Rachel O'Hare of the Huddersfield-based Pam Strickland Tappers footwork Abby Crawshaw, Esmee Taylor and Olivia Smith of the Huddersfield School of Theatre Dance, and (right) Matthew Flinders of Cowcliffe, a member of the Pam Strickland Tappers
A herd of thundering tappers stamps across the floor at Debbie en Dance Academy in Culver City, California.
getting ready The Newsome Tappers prepare for last year's Tapathon and Scholes-born entertainer Roy Castle (left)
As tappers, both siblings possess an air of easy elegance, with dazzling pyrotechnic footwork always at the ready.