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plural alexins
(biochemistry, dated) A protective substance that exists in the serum or other bodily fluid and is capable of killing microorganisms; complement. quotations examples
The seed of our destruction will blossom in the desert, the alexin of our cure grows by a mountain rock […]
1929, Thomas Wolfe, Look Homeward, Angel, New York: Scribner, Part One, Chapter 1, p. 3