R

/ahr/

v. Informal. are: Oysters R in season.

1. Chem. radical.

2. Math. ratio.

3. regular: a man's suit or coat size.

4. Elect. resistance.

5. restricted: a rating assigned to a motion picture by the Motion Picture Association of America indicating that children under the age of 17 will not be admitted unless accompanied by an adult. Cf. G (def. 7), PG, PG-13, X. [abbrev. for RESTRICTED]

6. Theat. stage right.

7. Physics. roentgen.

8. Chess. rook.

Symbol.

1. the 18th in order or in a series, or, when I is omitted, the 17th.

2. (sometimes l.c.) the medieval Roman numeral for 80. Cf. Roman numerals.

3. Biochem. arginine.

4. Physics. See universal gas constant.

5. registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.

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