IR

Multiple Entries:
  IR    Ir    in-    ir-    iridium  

Concise Oxford English Dictionary © 2008 Oxford University Press:
IR

▶abbreviation

• 1 infrared.

• 2 Iran (international vehicle registration).

Concise Oxford English Dictionary © 2008 Oxford University Press:
Ir

▶symbol the chemical element iridium.

Concise Oxford English Dictionary © 2008 Oxford University Press:
in-1 (also il- before l; im- before b, m, p; ir- before r)

▶prefix

• 1 (added to adjectives) not: infertile.

• 2 (added to nouns) without; a lack of: inappreciation.

– origin from L.

Concise Oxford English Dictionary © 2008 Oxford University Press:
in-2 (also il- before l; im- before b, m, p; ir- before r)

▶prefix in; into; towards; within: influx.

– origin representing in or the L. prep. in.

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

▶prefix variant spelling of in-1, in-2. assimilated before r (as in irradiate).

Concise Oxford English Dictionary © 2008 Oxford University Press:
iridium /ɪˈrɪdɪəm, ʌɪ-/

▶noun the chemical element of atomic number 77, a hard, dense silvery-white metal. (Symbol: Ir)

– origin C19: mod. L., from L. iris, irid- ‘rainbow’ (so named because it forms compounds of various colours).