virus noun Stress: first syllable 🤍 Save Syllables: vi-rus (2) English Definition An infective agent that is too small to be seen by light microscopy Example Sentence The flu is caused by a virus. US IPA /ˈvaɪrəs/ 🔊 Listen US UK IPA /ˈvaɪrəs/ 🔊 Listen UK Synonyms pathogen germ microbe bug Antonyms antidote Share this Word Facebook WhatsApp X Telegram Copy Link