Definition for ir (2 of 7)
Definition for ir (3 of 7)
Definition for ir (4 of 7)
Definition for ir (5 of 7)
Definition for ir (6 of 7)
Definition for ir (7 of 7)
Examples from the Web for ir
But given the attributes of the IR specialist, a profile similar to surgeons would not surprise.
Ef you're shore you won't need 'em, I'll borry a couple your ir'ns fer termorrer.The Tobacco Tiller|Sarah Bell Hackley
In my mothers service were 1500 to 2000 Mughls from the horde; as many more had come from ir with amza Sl.
Cuando la nia era an muy pequeita, el padre se vi obligado a ir a la gran ciudad, capital del Imperio.A First Spanish Reader|Erwin W. Roessler and Alfred Remy
The name formerly described the whole of the ir territory (Erskine).
While we were in Macha, Mull Hijr,597 the poet, came from ir and waited on me.
British Dictionary definitions for ir (1 of 5)
the internet domain name for
British Dictionary definitions for ir (2 of 5)
the chemical symbol for
British Dictionary definitions for ir (3 of 5)
British Dictionary definitions for ir (4 of 5)
British Dictionary definitions for ir (5 of 5)
Medical definitions for ir
Scientific definitions for ir (1 of 2)
Scientific definitions for ir (2 of 2)
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.