quinquedentateadj.
/ˌkwɪŋkwᵻˈdɛnteɪt/, U.S. /ˌkwɪŋkwəˈdɛnˌteɪt/ 1. Botany and Zoology. Having five teeth or toothlike processes. Cf. quinquedentated adj. at quinque- comb. form . Now rare.
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1760 J. Lee Introd. Bot. ii. xx. 114 Calyx... The Brim quinquedentate, acute, erect, oblique, unequal.
1790 J. Bolton Filices Britannicae II. 65 [The second leaves] are unequal in length, consisting of an uncertain number of pentagular joints, with quinquidentate black vaginæ at each joint.
?a1808 Universal Syst. Nat. Hist. XIV. 184 Calyx..a perianthium monophyllous, quinquedentate, or five-toothed, plain at the base, marescent, or withering on the plant.
1861 R. Bentley Man. Bot. i. iv. 225 Five-toothed or quinquedentate.
1938 Trans. Amer. Entomol. Soc. 64 168 Pygidium quinquedentate, the inner lateral tooth spinoid and the longest.
2. Chemistry. Of a ligand: forming five separate bonds. Of a complex: formed by such a ligand.
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1937 H. Diehl in Chem. Rev. 21 40 The following classification is, however, obvious: A. Unidentate..B. Bidentate..and so on for quinquidentate and sexadentate.
1953 Jrnl. Amer. Chem. Soc. 75 1736/1 Some quadri-, quinque- and sexadentate groups can be postulated (and even prepared) which are not at all likely to coördinate to a common center.
1972 Bioinorganic Chem. 1 230 An x-ray study of H4EDTA complexes with divalent inorganic ions..showed that the ligand is quinquedentate.
2001 J. M. Alía in I. R. Lewis & H. G. M. Edwards Handbk. Raman Spectroscopy xvi. 633 A dimeric complex..which consists of two quinquedentate hexacoordinate Fe(III) moieties with a Fe-O-Fe bridging unit was detected.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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adj.1760