polybasicadj.
/ˌpɒlɪˈbeɪsɪk/, U.S. /ˌpɑliˈbeɪsɪk/ Chemistry.
1. Of an acid: having more than one replaceable hydrogen atom per molecule, or two or more carboxylic acid groups. Formerly also: †designating a salt of such an acid (obsolete).
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polybasic1845
1845 E. A. Parnell Elements Chem. Anal. (new ed.) 68 By a polybasic acid is meant an acid, one equivalent of which requires more than one equivalent of a base to form a neutral salt.
1851 H. Watts tr. L. Gmelin Hand-bk. Chem. V. 225 Phosphate of ferric oxide, or ferric phosphate... Polybasic.
1946 Proc. Royal Soc. A. 185 439 Although these acids are polybasic in the sense that more than one carboxyl is attached to each molecule, their dissociation is characterized by a single constant.
1972 R. O. C. Norman & D. J. Waddington Mod. Org. Chem. xxi. 321 Polyester fibres are formed by condensation of polyhydric alcohols and polybasic acids.
2. Of an alcohol: containing two or more hydroxyl groups per molecule; polyhydric.
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1880 Jrnl. Amer. Chem. Soc. 2 368 The investigation will be continued, and will embrace the action upon polybasic alcohols.
1940 Chem. Rev. 26 25 More than one =CO group may be present as in..polybasic alcohols partly or completely esterified with mono- and/or poly-basic acids.
1999 Plastics Engin. (Nexis) 1 May 49 A resin formed by the partial reaction of a polybasic alcohol with a saturated or unsaturated polybasic acid.
3. Of the nature of a polybase; consisting of several or many bases.
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1966 Biochemistry 5 3337/1 Aliphatic polyamines are among the polybasic substances which enhance ambiguity in bacterial systems.
1987 Proc. National Acad. U.S.A. 84 326/2 Fig. 4 shows the effect of some polybasic peptides on the phosphorylation of oocyte membrane inositolphospholipids.
2001 Science (Nexis) 1 Nov. 977 The combination of hydrophobic and polybasic motifs that anchor some receptors to anionic phospholipids in these lipid domains.
Derivatives
ˌpolybaˈsicity n. the property of being polybasic.
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polybasicity1861
1861 Proc. Royal Soc. 11 117 Oxy-terephthalic acid... It may be expected that the history of this acid will throw some light on the law of polybasicity.
1912 E. Feilmann tr. E. Molinari Treat. Inorg. Chem. 46 In 1835 Graham demonstrated the polybasicity of phosphoric acid.
1997 W. H. Brock Justus von Liebig iii. 86 It was not until Liebig met Graham..in 1836 that Liebig understood the significance of polybasicity for the composition of organic acids.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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adj.1845