Irn.

Brit.

/ˌʌɪˈɑː/, U.S.

/ˌaɪˈɑr/

Origin: Formed within English, by clipping or shortening. Etymon: iridium n.

Etymology: Symbolic abbreviation for iridium n.

Chemistry.

The element iridium.

ΚΠ

1826 tr. J. J. Berzelius in Ann. Philos. New Ser. 11 422 Osmiuret of iridium. IrOs^x [Fr. Osmiure d'iridium. Ir OS^x].

1863 Chem. News 14 Feb. 74/1 The iridium and sodium salt has the formula Ir₂Cl₃,3NaCl + 24 HO, and crystallises well.

1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 159 An indigo-blue colloidal ppt. of Ir(OH)₄.

2012 C. H. Langmuir & W. Broecker How to build Habitable Planet xvii. 518 Ir was..so abundant that it could not be explained by the tiny amounts of cosmic dust entering the atmosphere.

This is a new entry (OED Third Edition, December 2013; most recently modified version published online March 2022).

I.R. n. infra-red.

1957 Which? Autumn 7/2 An investigation into the effects, on bottle-makers, of the infra-red and ultra-violet (often referred to as I.R. and U.V.) radiations.

1967 Electronics 40 127/1 A scope tracing that shows i-r energy as a curve derived from the video signal, with the amount of energy determining vertical deflection.

单词	ir
释义	Irn. Brit. /ˌʌɪˈɑː/, U.S. /ˌaɪˈɑr/ Origin: Formed within English, by clipping or shortening. Etymon: iridium n. Etymology: Symbolic abbreviation for iridium n. Chemistry. The element iridium. ΚΠ 1826 tr. J. J. Berzelius in Ann. Philos. New Ser. 11 422 Osmiuret of iridium. IrOs^x [Fr. Osmiure d'iridium. Ir OS^x]. 1863 Chem. News 14 Feb. 74/1 The iridium and sodium salt has the formula Ir₂Cl₃,3NaCl + 24 HO, and crystallises well. 1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 159 An indigo-blue colloidal ppt. of Ir(OH)₄. 2012 C. H. Langmuir & W. Broecker How to build Habitable Planet xvii. 518 Ir was..so abundant that it could not be explained by the tiny amounts of cosmic dust entering the atmosphere. This is a new entry (OED Third Edition, December 2013; most recently modified version published online March 2022). > see also also refers to : ir-prefix¹ also refers to : ir-prefix² also refers to : -ir-comb. form > as lemmas I.R. I.R. n. infra-red. Π 1957 Which? Autumn 7/2 An investigation into the effects, on bottle-makers, of the infra-red and ultra-violet (often referred to as I.R. and U.V.) radiations. 1967 Electronics 40 127/1 A scope tracing that shows i-r energy as a curve derived from the video signal, with the amount of energy determining vertical deflection. extracted from In.¹ < n.1826 see also as lemmas
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Irn.

> see also

> as lemmas