IR

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Ir,

symbol for the element iridiumiridium
, metallic chemical element; symbol Ir; at. no. 77; at. wt. 192.217; m.p. about 2,410°C;; b.p. about 4,130°C;; sp. gr. 22.55 at 20°C;; valence +3 or +4.
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IR

Abbrev. for infrared.

Ir

(chemistry)

IR

Abbr. for “inside radius.”

IR

(networking)

IR

(electronics)

ir

(networking)
The country code for Iran.

IR

(1) (Industry Remarketer) See VAR and VAD.

(2) See infrared, IR detector and IrDA.

(3) See information resources.