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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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IRAbbrev. for infrared.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Abbr. for “inside radius.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
The country code for Iran.
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IR(1) (Industry Remarketer) See VAR and VAD.
(2) See infrared, IR detector and IrDA.
(3) See information resources.
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