effusion

noun

1. (countable, uncountable)A liquid outpouring.
2. (countable, uncountable)Process of gases passing through a hole or holes considerably smaller than the mean free path of the gas molecules.
3. (broadly, countable, figuratively, uncountable)An outpouring of speech or emotion.

   “1930; George S. Kaufman, Morrie Ryskind, Bert Kalmar, Harry Ruby; Animal Crackers, Paramount Pictures Captain Spaulding: My friends, I am highly gratified by this magnificent display of effusion […]”

   “The housekeeper, a very decorative brunette of thirty-five with a pseudo-English accent, greeted him with a mixture of grateful effusion and condescending patronage.”

4. (countable, uncountable)The seeping of fluid into a body cavity; the fluid itself.

   “pleural effusion”