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Any of various derivatives of urea.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Elements & Compounds) any of a class of organic compounds derived from urea by replacing one or more of its hydrogen atoms by organic groups
2. (Elements & Compounds) any of a class of derivatives of urea and carboxylic acids, in which one or more of the hydrogen atoms have been replaced by acyl groups: includes the cyclic ureides, such as alloxan
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈyʊər iˌaɪd, -ɪd)

an acyl urea.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Nickel is involved in activation of urease enzyme, hence most of Ni essentiality studies were focused on legumes due to higher urease activity in seeds of legumes and transportation of absorbed N as ureids compounds within plant body, which requires urease (Holland et al., 1987; Welch, 1981; Bollard, 1983; Walker et al., 1985).