Ir

Noun

CIDE DICTIONARY

Ir, n.

The chemical symbol for iridium, a metallic element of the platinum group. It has atomic number 77 and an atomic weight of 192.22. [WordNet 1.5]

Ir, abbr. infrared.

Ir, symb. Chem. the element iridium.

Also see definition of "Ir" in Bible Study Dictionaries
For further exploring for "Ir" in Webster Dictionary Online

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