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r    音标拼音: ['ɑr]
n. 字母r

字母r

R
n 1: a unit of radiation exposure; the dose of ionizing
radiation that will produce 1 electrostatic unit of
electricity in 1 cc of dry air [synonym: {roentgen}, {R}]
2: (physics) the universal constant in the gas equation:
pressure times volume = R times temperature; equal to 8.3143
joules per kelvin per mole [synonym: {gas constant}, {universal
gas constant}, {R}]
3: the 18th letter of the Roman alphabet [synonym: {R}, {r}]
4: the length of a line segment between the center and
circumference of a circle or sphere [synonym: {radius}, {r}]

R \R\ ([aum]r).
R, the eighteenth letter of the English alphabet, is a vocal
consonant. It is sometimes called a semivowel, and a liquid.
See Guide to Pronunciation, [sect][sect] 178, 179, and
250-254. "R is the dog's letter and hurreth in the sound."
--B. Jonson.
[1913 Webster]

Note: In words derived from the Greek language the letter h
is generally written after r to represent the aspirated
sound of the Greek "r, but does not affect the
pronunciation of the English word, as rhapsody,
rhetoric.
[1913 Webster] The English letter derives its form from
the Greek through the Latin, the Greek letter being
derived from the Ph[oe]nician, which, it is believed,
is ultimately of Egyptian origin. Etymologically, R is
most closely related to l, s, and n; as in bandore,
mandole; purple, L. purpura; E. chapter, F. chapitre,
L. capitulum; E. was, were; hare, G. hase; E. order, F.
ordre, L. ordo, ordinis; E. coffer, coffin.
[1913 Webster]

{The three Rs}, a jocose expression for reading, (w)riting,
and (a)rithmetic, -- the fundamentals of an education.
[1913 Webster]



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  • Reddit - Dive into anything
    Reddit is a network of communities where people can dive into their interests, hobbies and passions There's a community for whatever you're interested in on Reddit
  • r all - Reddit
    Today's top content from hundreds of thousands of Reddit communities
  • r reddit
    Introducing localized posts! We are experimenting with translating some r reddit posts into different languages and linking them here We hope to expand language selections over time, so please stay tuned for updates if your preferred language is not currently available Posts The Community Funds application is open!
  • r whenthe - Reddit
    r whenthe: The funny moving pictures with text subreddit (REIMAGINED) 😔
  • newline - Difference between \n and \r? - Stack Overflow
    in old Mac systems (pre-OS X), \r was the code for end-of-line instead; in Windows (and many old OSs), the code for end of line is 2 characters, \r\n, in this order; as a (surprising;-) consequence (harking back to OSs much older than Windows), \r\n is the standard line-termination for text formats on the Internet
  • Ask Reddit. . .
    r AskReddit is the place to ask and answer thought-provoking questions
  • r Seattle - Reddit
    We aim to make the Seattle reddit a friendly place for everyone, so treat your fellow humans with respect Content that contains racism, sexism, homophobia, harassment, threats, or other toxic content will be removed, regardless of popularity or relevance - and may lead to warnings or
  • r Helldivers - Reddit
    A subreddit dedicated to HELLDIVERS and HELLDIVERS 2, intense co-op shooters set in a satirical dystopian future where you play as one of mankind's elite soldiers determined to spread managed democracy Developed by Arrowhead Game Studios
  • r premed - Reddit
    In order to help reduce spam on our subreddit, users must have at least 10 comment karma in order to participate on r premed, and all accounts must be at least 72 hours old To gain karma, post comments on other subreddits and gain upvotes Check out r Karma4Free if you're really desperate
  • r news - Reddit
    Opinion and analysis should go in r Foodforthought or another relevant subreddit This includes articles with editorial opinion, personal conjecture, or otherwise Press releases with an editorial slant, and analysis of news events (rather than reporting on the event itself) are not allowed





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