Libby UK/ˈlɪbi/ US/ˈlɪˌbi/ fairly common noun 1. United States chemist who developed a method of radiocarbon dating (1908-1980) SynonymsWillard Frank Libby Related words Broader terms chemist WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.