Top 3 Longest Words in English №1 Pneumonoultramicroscopicsilicovolcanoconiosis [45 letters] Meaning: a lung disease caused by inhaling very fine ash and sand dust №2 Hippopotomonstresesquippedaliophobia [36 letters] Meaning: Fear of long words №3 Supercalifragilisticexpialidocious [34 letters] Meaning: extraordinarily good Boost Your English 553 views08:38