Encyclopedia

derichment

derichment

[dē′rich·mənt]
(analytical chemistry)
In gravimetric analysis by coprecipitation of salts, a system with λ less than unity, when λ is the logarithmic distribution coefficient expressed by the ratio of the logarithms of the ratios of the initial and final solution concentrations of the two salts.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

derichment

A condition in the fuel-metering system in which the fuel-air mixture is leaned out, or deriched, when antidetonation injection fluid is injected into the engine. If this is not done, the mixture would be enriched by the antidetonation fluid, and the engine might not develop its maximum power.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive
The book unfolds in themes: each chapter can stand alone as an essay on some aspect of caving--the "squeeze," cave conservation, and derichment. The last is Hurd's own term for how the mind works when it undergoes subtraction and absence.
Her brightest moments come in chapters six, in which she dwells on the beauty of cave formations, and nine, which ruminates on derichment. In practically the same stroke, however, she is prone to what I would term metaphors-gone-mad, by which I mean, carrying on too far and for too long on subjects for which shorter, succinct descriptions would suffice.
Calm in Dark Places : Though her first caving experience was one of panic, Barbara Hurd returns to explore the spiritual mystery and power of caves
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