Wiktionary
mechanized cavalry
n. The branch of the modern military that is transported by light fast vehicles (including jeeps and helicopters). These units now serve the function historically provided by a horse cavalry.
WordNet
mechanized cavalry
n. an armored unit of a modern army equipped with motor vehicles
Usage examples of "mechanized cavalry".
Rose of the 113th Mechanized Cavalry remembers a tank commander reporting solemnly to the group leader: “.
Another company of mechanized Cavalry was performing a similar movement well off to his right.