There are 2 definitions of Ir in English:

Ir1

Line breaks: Ir

symbol

The chemical element iridium.

Definition of Ir in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude

There are 2 definitions of Ir in English:

IR2

Line breaks: IR

abbreviation

1Infrared.
1.1Iran (international vehicle registration).

Definition of Ir in: