Langmuir, Irving Syllabification: (Lang·muir, Irving)Pronunciation: /ˈlaNGˌmyo͝or/Definition of Langmuir, Irving (1881–1957), US chemist and physicist. His principal work was in surface chemistry, especially applied to catalysis. He also worked on high-temperature electrical discharges in gases and studied atomic structure. Langmuir, Irving in other Oxford dictionaries Definition of Langmuir, Irving in the British & World English dictionary