What is the biggest medical term?

Answer 1

pumonoultramicroscopicsilicovolcanocaneosis which means a lung disease caused by inhaling volcanic ash
PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­CONIOSIS - A rare medical condition, and often said as a fictitious diagnosis, in which a person has lung degeneration and lung diseases associated with inhaling the silica dust around volcanoes. It is the longest medical word.

Answer 2

If you mean the longest medical word, then it is the word: pneumonoultramicroscopicsilicovolcanoconiosis, which is a lung disease caused by the inhalation of very fine silica dust, causing inflammation in the lungs.