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Meaning of immunodiffusion

im•mu•no•dif•fu•sion

Pronunciation: (im"yu-nō-di-fy'zhun, i-my"-), [key]
— n.
  1. any of various analytical techniques that involve antigen and antibody solutions diffusing toward each other in a gel until antibody binds specifically to antigen to form a precipitate.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.