Oxford Dictionary English microorganism noun noun BrE BrE//ˌmaɪkrəʊˈɔːɡənɪzəm// ; NAmE NAmE//ˌmaɪkroʊˈɔːrɡənɪzəm// (specialist) Add to my wordlistjump to other results a very small living thing that you can only see under a microscopeSee microorganism in the Oxford Learner's Dictionary of Academic EnglishCheck pronunciation: microorganism oxfordlearnersdictionaries.com
