| 释义 |
tris-, prefix|trɪs|
repr. Gr. τρίς thrice (which occurs as prefix, τρισ-, in numerous Gr. compounds, chiefly adjs.): used in Eng. in a few technical words of various kinds, and in Chemistry.
1. See trisagion, trisdiapason, trismegist, trisoctahedron, tristetrahedron.
2. Chem.
†a. Used in the early part of the 19th century, after T. Thomson (First Princ. Chem. (1825) I. p. xx), prefixed to the modified name of the chlorous element or of the acid, denoting that three atoms or molecules, not of this element or acid, but of the other component, are present in the compound named; e.g. trisphosphuret of copper, a compound of one atom of phosphorus and three atoms of copper; trisacetate of lead, a compound of one molecule of acetic acid and three molecules of lead oxide. (Cf. tri- 5 a, note.) Obs.
1836[see trisnitrate]. 1848R. D. Thomson School Chem. 39 Greek numerals denote an increase in the base, as B2O is a Disoxide, or Dinoxide, while BO is a trisoxide. The same nomenclature is applied to the acids.
b. Now used prefixed to the names of complex radicals or compounds, signifying that the whole complex is present thrice over, and not merely the single element or radical immediately following the prefix; e.g. trisbenzene-azophenol, C6H2(N:NC6H5)3OH, a compound containing three N:NC6H5 groups substituted in phenol, C6H5OH; tristhio-dimethyl-benzaldehyde, {ob}C6H3(CH3)2.CHS{cb}3, in which the whole group is present thrice.
1907Jrnl. Chem. Soc. XCII. i. 800 Trisbenzeneazoresorcinol, C6H(OH)2(N2Ph)3. |