Added 9 October 2026 pollutant /pəˈl(j)uːtənt/ noun Categories: NatureRare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about pollutant at Wordnik → Where our words come from → A foreign substance that makes something dirty, or impure, especially waste from human activities. Related Words: pollutecontaminantcontaminationpolluterpollutingpolluteddirtynoxiouswastefulpersistentemissionclean Back to today's word