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18th letter of the alphabetalphabet
[Gr. alpha-beta, like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.
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, corresponding to Greek rho. When in Latin alphabets the letters for p and r became similar in appearance, the rho form (P; which at first was used for the r sound) was restricted to the p sound, and an extra line was added for the r sound (R). In Greek, where no confusion developed, the rho continued to look like Latin P. A modification of R is the symbol ℞, used medically for recipe [Lat.,=take] and liturgically for responsum [Lat.,=response].
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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. Abbr. for “radius.”
2. Abbr. for “right.”
3. Symbol for the capacity of a pile (for example, 3R indicates three times design capacity).
4. Symbol for the thermal resistance of a material or component of construction.
5. Symbol for electrical resistance.

sound reduction index, R

British term for sound transmission loss.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


A programming language for statistical computing and graphics that is released under the GNU license. R was designed to handle a wide variety of complex statistical tasks, and many user-developed routines are also available. R is the open source version of S, which was developed in the mid-1970s by John Chambers at Bell Labs (S-PLUS was a commercial version from TIBCO Software). For more information, visit www.r-project.org.
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References in periodicals archive ?
The report added treatment of Mr R's infection was delayed by least a week, which made it harder to treat the infection and for his body to fight it.
I am glad I could inspire young minds to take this initiative and create awareness in order to help sustain the environment and pledge to follow the five R's of Green Gratitude."
First, R's negative face threat might predict S making an apology to lessen the threat triggered by favor asking.
CMS officials also talked about the three R's programs' dunning letters.
Phillips' strike at Bloomfield Road was only his second for the R's, but he took his gift-wrapped chance well after being set up by a poor clearance from Blackpool keeper Matt Gilks.
The Golf R's 4MOTION four-wheel drive is the latest fifth-generation Haldex system which decouples the rear axle under low loads or when coasting to reduce fuel consumption.
Combine this rhotic speech pattern (basically, how people pronounce their "r's") with the stretched-out "a's", as in "fah-thah (for "father"), and the widened "o's" ("taw-nic" instead of "tonic") and you get what many out-of-staters know as the Boston accent - and what most everyone else knows as the New England accent.
Speaking after the meeting with Mr King, Olive i r's mum Joanne and Cllr Jake Morrison, Mrs Soubry said: "It was a real honour to meet with Olive i r's parents.
The January transfer window has seen the R's chairman and new manager Harry Redknapp flashing the cash, with Christopher Samba and Loic Remy brought in for PS20.5m.
The R's players were jeered off the pitch following Sunday's 1-1 home draw against fellow strugglers Reading to claim only their fourth league point of the campaign.
That's the medical term for not being able to pronounce your 'R's' by the way.
But the judging panel felt that it was the pounds 51,728 Cayman R's completeness, steering and ride that stood out - no mean feat considering that last year's winner, the Porsche 911 GT3 RS, was also a contender.