"Large droplets" refers to relatively big and heavy liquid particles that are visible to the naked eye and can fall to the ground quickly, especially when someone is coughing, sneezing, or talking loudly. Full definition
Large droplets of liquid can cause lensing effects, a bending of light that can scramble the results from the interferometer. (sciencedaily.com)
This changes the brightness of the atmosphere (many small droplets reflect more than a few larger droplets made from the same amount of water vapor). (williamcalvin.com)
In 1967 van der Hulst devised a modified Mie calculation to reduce the number of Lagrangian terms when solving for back - reflection from large droplets. (notrickszone.com)