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The univalent group, -COOH, the functional group characteristic of all organic acids.

car′box·yl′ic (-sĭl′ĭk) adj.
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.


(kɑrˈbɒk sɪl)
the univalent group COOH, of organic acids.
[1865–70; carb- + ox (ygen) + -yl]
car`box•yl′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.carboxyl - the univalent radical -COOH; present in and characteristic of organic acids
chemical group, radical, group - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
Adj.1.carboxyl - relating to or containing the carboxyl group or carboxyl radical
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
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References in periodicals archive ?
In these figures, lower precision in the carboxyl end-group concentration measurements is reflected by the greater degree of scatter in these data than in the amine end-group concentration data (Schaffer et al., 2003a; Zheng et l., 2005).
Each amino acid includes a central carbon atom and each of the following functional groups: hydrogen, amino, and carboxyl. Each student should prepare the index cards in Figure 2.
In the example described here, an RNase A enzyme is converted into a zymogen by adding to the enzyme a bridge of amino acids linking the amino and carboxyl termini of the enzyme.
The coat layer comprises a copolymerized polyester having carboxyl group terminals and Tg in the range of 70 to 80[degrees] C., and is formed in an amount ranging from 0.01 to 0.1 g/[m.sup.2] on the base film surface.
To determine the source of the carboxyl group, Zhang et al.
In that area the intensity of the carboxyl peak with the increase of ageing period can be seen, which is the result of the oxidation ageing processes.
An amino acid is an amphoteric organic acid containing both a basic amino group (N[H.sub.2]) and an acidic carboxyl group (COOH).
Addition of a jelling agent such as hydroxypropyl methlycellulose, carboxyl methylcellulose, chitosan, etc., to the cement liquid can improve the washout resistance of the cement paste before hardening occurs, allowing CPC to harden in standing water (11).
Called CHIP (carboxyl terminus of Hsc70-interacting protein), this molecule decides the fate of malformed proteins in heart muscles, says Cam Patterson of the University of North Carolina at Chapel Hill.
The biologically active portion of the molecule is its amidated carboxyl terminus.
The peak intensity at 957 [cm.sup.-1], assigned to the O--H vibrations in carboxyl groups, a potential product of chain scission of PLA, was chosen to calculate the carboxyl index for each film [30, 31].