Ar

Multiple Entries:
  Ar    AR    -ar    ad-    ar-    argon  

Concise Oxford English Dictionary © 2008 Oxford University Press:
Ar

▶symbol the chemical element argon.

Concise Oxford English Dictionary © 2008 Oxford University Press:
AR

▶abbreviation

• 1 US Arkansas (in official postal use).

• 2 Autonomous Republic.

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ar1

▶suffix

• 1 (forming adjectives) of the kind specified: molecular.

• 2 forming nouns such as scholar. Compare with -er5.

– origin from OFr. -aire, -ier, or from L. -aris.

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ar2

▶suffix forming nouns such as pillar.

– origin via OFr. from L. -are (neut. of -aris).

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ar3

▶suffix forming nouns such as bursar.

– origin from OFr. -aire, -ier, or from L. -arius, -arium.

Concise Oxford English Dictionary © 2008 Oxford University Press:
-ar4

▶suffix alteration of -er1, -or1 (as in liar).

Concise Oxford English Dictionary © 2008 Oxford University Press:
ad- /ad/ (also a- before sc, sp, st; ac- before c, k, q; af- before f; ag- before g; al- before l; an- before n; ap- before p; ar- before r; as- before s; at- before t)

▶prefix

• 1 denoting motion or direction to: advance.

• 2 denoting reduction or change into: adulterate.

• 3 denoting addition or increase: adjunct.

– origin from L. ad ‘to’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
ar-/ar/

▶prefix variant spelling of ad- assimilated before r (as in arrive).

Concise Oxford English Dictionary © 2008 Oxford University Press:
argon /ˈɑːgɒn/

▶noun the chemical element of atomic number 18, an inert gaseous element of the noble gas group. (Symbol: Ar)

– origin C19: from Gk, neut. of argos ‘idle’, from a- ‘without’ + ergon ‘work’.