immunodiffusion

im·mu·no·dif·fu·sion

[im-yuh-noh-di-fyoo-zhuhn, ih-myoo-]
noun
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.

Origin:
1955–60; immuno- + diffusion

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American Heritage
Medical Dictionary

immunodiffusion im·mu·no·dif·fu·sion (ĭm'yə-nō-dĭ-fy&oomacr;'zhən, ĭ-my&oomacr;'-)
n.
A technique for studying reactions between antigens and antibodies by observing precipitates formed by the combination of specific antigens and antibodies that have diffused in a gel in which they have been separately placed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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00:10
Immunodiffusion has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
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