Registered-trademark
Symbol.
1.
the 18th in order or in a series, or, when I is omitted, the 17th.
2.
(sometimes lowercase) the medieval Roman numeral for 80.
Compare Roman numerals.
3.
Biochemistry. arginine.
4.
Physics. universal gas constant.
5.
registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.
noun (pl) r’s, R’s, Rs
1.
the 18th letter and 14th consonant of the modern English alphabet
2.
a speech sound represented by this letter, in English usually an alveolar semivowel, as in red
3.
See three Rs
symbol
1.
(chem) radical
2.
(currency)
rand
rupee
3.
Réaumur temperature (scale)
4.
(physics, electronics) resistance
5.
roentgen or röntgen
6.
(chess) rook
7.
Royal
8.
(chem) gas constant
9.
(in the US and Australia)
restricted exhibition (used to describe a category of film certified as unsuitable for viewing by anyone under the age of 18)
(as modifier): an R film
r abbr.
racemic
R abbr.
radical (usually an alkyl or aryl group)
respiration
respiratory exchange ratio
or r roentgen
r
Abbreviation of radius
R
The symbol for resistance.
r
1.
correlation coefficient
2.
radius
3.
resistance
R
1.
gas constant
2.
radical
3.
rain
4.
range
5.
Réaumur
6.
receiver
7.
registered trademark
8.
Republican
9.
response
10.
restricted (children under 17 must be accompanied by a parent or guardian)
11.
right
12.
roentgen
13.
rook
14.
run
see: three R’s
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