- intelligence ratio.
- information retrieval.
- variant of in-2 (by assimilation) before r: irradiate.
- variant of in-3 (by assimilation) before r: irreducible.
- immediate reserve.
- infantry reserve.
- intelligence ratio.
- internal revenue.
Examples from the Web for ir
Contemporary Examples of ir
But given the attributes of the IR specialist, a profile similar to surgeons would not surprise.Doctors as Doormats in the David Petraeus Scandal
November 14, 2012
Historical Examples of ir
When those in ir heard of his approach, they took their precautions; Sl.
Samarkand is taken, one Mrz may seat himself there, the other in ir.
While we were in Macha, Mull Hijr,597 the poet, came from ir and waited on me.
He drew off for ir with all his brothers and his whole following.
Mamd Mrz from ir with 1,000 men and did not issue out of Qndz.
- (formerly, in Britain) Inland Revenue
- Iran (international car registration)
assimilated form of Latin prefixes in- (see in-) before -r-.
- The symbol for the elementiridium
- The symbol for iridium.
- A rare, whitish-yellow element that is the most corrosion-resistant metal known. It is very dense, hard, and brittle, and is is used to make hard alloys of platinum for jewelry, pen points, and electrical contacts. Atomic number 77; atomic weight 192.2; melting point 2,410°C; boiling point 4,130°C; specific gravity 22.42 (at 17°C); valence 3, 4. See Periodic Table.
A Closer Look: In 1978 geologist Walter Alvarez discovered a high concentration of iridium in a layer of clay that had formed between the Mesozoic and Cenozoic eras, a period about 65 million years ago during which dinosaurs and many other organisms became extinct. This finding was significant as iridium is rare at Earth's surface (an unusually high concentration is called an iridium anomaly). Most surface iridium is thought to come from dust created when meteors disintegrate in the atmosphere or collide with Earth. Alvarez's father, the physicist Luis Alvarez, suggested that the iridium might have come from the impact of a meteor about 10 km (6.2 mi) across. Such an impact would have caused an enormous explosion, sending huge clouds of dust into the atmosphere. The dust, blocking out the Sun and causing extensive acid rain, would have triggered a worldwide ecological disaster. Many scientists think that such a disaster caused the extinction of the dinosaurs and at least 70 percent of all other species alive at the time, including most of Earth's land plants. Geologists have since found iridium deposits in rocks of a similar age in more than 100 places worldwide. Scientists in the early 1990s identified a large impact crater in the Yucatán peninsula of central Mexico that is the same age as the iridium deposit found by Alvarez. It is 200 km (125 mi) wide and may have been caused by the same impact.