Added 10 October 2026 pneumoniac adjective adjective ! Definition from Wiktionary (CC BY-SA). More about pneumoniac at Wordnik → Where our words come from → Of or relating to pneumonia. noun A person who has pneumonia. Related Words: pneumonicpneumoniticpneumonologicpneumologicalpneumonopathicpneumonickpneumoconioticbronchopneumonialpneumococcicpneumonialikepneumococcalpneumonological Back to today's word