ARDS UK/ɑːdz/ US/ɑɹdz/ uncommon noun 1. the process of becoming acid or being converted into an acid Synonymsadult respiratory distress syndromewet lungwhite lung Related words Broader terms respiratory disease WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.