1. A liquid outpouring.
  2. (chemistry) Process of gases passing through a hole or holes considerably smaller than the mean free path of the gas molecules.
  3. (figurative, by extension) 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 […]
  4. (medicine) the seeping of fluid into a body cavity; the fluid itself.
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