Rn


Symbol, Chemistry.

Definition for rn (2 of 2)

R.N.

British. Royal Navy.
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Examples from the Web for rn

British Dictionary definitions for rn (1 of 2)

Rn

the chemical symbol for

radon

British Dictionary definitions for rn (2 of 2)

RN

abbreviation for

(in Canada) Registered Nurse
Royal Navy

symbol for

Niger (international car registration)

Word Origin for RN

(sense 3) From R(epublic of) N(iger)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for rn (1 of 2)

Rn

The symbol for the elementradon

Medicine definitions for rn (2 of 2)

RN

abbr.

registered nurse
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for rn (1 of 2)

Rn

The symbol for radon.

Science definitions for rn (2 of 2)

radon
[ rādŏn ]

Rn

A colorless, odorless, radioactive element in the noble gas group. It is produced by the radioactive decay of radium and occurs in minute amounts in soil, rocks, and the air near the ground. Radon is used as a source of radiation for the treatment of cancer and other diseases. Its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point -71°C; boiling point -61.8°C; specific gravity (solid) 4. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.