flu noun Stress: first syllable 🤍 Save Syllables: flu (1) English Definition An infectious disease caused by an influenza virus. Example Sentence He was in bed for a few days with the flu. US IPA /fluː/ 🔊 Listen US UK IPA /fluː/ 🔊 Listen UK Synonyms influenza grippe cold viral infection Antonyms health wellness Share this Word Facebook WhatsApp X Telegram Copy Link