Medical Definition of lung fluke
: a fluke invading the lungs; especially : either of two Old World forms of the genus Paragonimus (P. westermanii and P. kellicotti) that produce lesions in humans which are comparable to those of tuberculosis and that are acquired by eating inadequately cooked freshwater crustaceans which act as intermediate hosts
Seen and Heard
What made you want to look up lung fluke? Please tell us where you read or heard it (including the quote, if possible).