AR

variant of -er², often under the influence of a spelling with -ar- in a cognate Latin noun: burglar; cellar; collar; mortar; poplar; scholar; vicar; vinegar.

variant of -er¹. on the model of -ar², used in the formation of nouns of agency: liar; beggar.

annual return.

Arkansas (approved especially for use with zip code).

Army Regulation; Army Regulations.

Arabic.

Symbol, Chemistry.

arrive; arrives.

account receivable.

accounts receivable.

Also, a/r.

annual return.

Army Regulation; Army Regulations.

Insurance. all risks.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To AR

Collins

World English Dictionary

ar

—*the internet domain name for*
	Argentina

Ar

—*the chemical symbol for*
	argon

AR

—*abbreviation for*
1.	Arkansas
2.	Autonomous Region
3.	Also: A/R (in the US and Canada) accounts receivable

Ar.

—*abbreviation for*
1.	Arabia(n)
2.	Also: Ar Arabic

a.r.

—*abbreviation for*
	anno regni

[Latin: in the year of the reign]

-ar

—*suffix forming adjectives*
	of; belonging to; like: linear; polar; minuscular

[via Old French -er from Latin -āris, replacing -ālis (-al¹) after stems ending in l]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

arête

"sharp crest of a mountain," 1862, from Swiss Fr., from L. arista "ear of grain," which probably is of Etruscan origin.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

Ar
The symbol for the element argon.

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

Science Dictionary

Ar
The symbol for argon.

argon

(är'gŏn') Pronunciation Key
Symbol Ar
A colorless, odorless element in the noble gas group. Argon makes up about one percent of the atmosphere. It is used in electric light bulbs, fluorescent tubes, and radio vacuum tubes. Atomic number 18; atomic weight 39.948; melting point -189.2°C; boiling point -185.7°C. See Periodic Table.

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