tris-comb. form

Stress is usually determined by a subsequent element and vowels may be reduced accordingly.

Etymology: < Greek τρίς thrice (which occurs as prefix, τρισ-, in numerous Greek compounds, chiefly adjectives): used in English in a few technical words of various kinds, and in Chemistry.

1. See trisagion n., trisdiapason n., trismegist n., trisoctahedron n., tristetrahedron n.

2. Chemistry.

†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- comb. form 3a, note.) Obsolete.

ΚΠ

1836 Pharmacopoeia Royal Coll. Physicians 217 Trisnitrate of Bismuth was formerly employed as a cosmetic under the name of magistery of Bismuth..represented to possess anti-spasmodic powers.

1848 R. 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. In later use 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, {C₆H₃(CH₃)₂.CHS}₃, in which the whole group is present thrice.

ΚΠ

1907 Jrnl. Chem. Soc. 92 i. 800 Trisbenzeneazoresorcinol, C₆H(OH)₂(N₂Ph)₃.

This entry has not yet been fully updated (first published 1915; most recently modified version published online September 2021).

单词	tris-
释义	tris-comb. form Stress is usually determined by a subsequent element and vowels may be reduced accordingly. Etymology: < Greek τρίς thrice (which occurs as prefix, τρισ-, in numerous Greek compounds, chiefly adjectives): used in English in a few technical words of various kinds, and in Chemistry. 1. See trisagion n., trisdiapason n., trismegist n., trisoctahedron n., tristetrahedron n. 2. Chemistry. †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- comb. form 3a, note.) Obsolete. ΚΠ 1836 Pharmacopoeia Royal Coll. Physicians 217 Trisnitrate of Bismuth was formerly employed as a cosmetic under the name of magistery of Bismuth..represented to possess anti-spasmodic powers. 1848 R. 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. In later use 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, {C₆H₃(CH₃)₂.CHS}₃, in which the whole group is present thrice. ΚΠ 1907 Jrnl. Chem. Soc. 92 i. 800 Trisbenzeneazoresorcinol, C₆H(OH)₂(N₂Ph)₃. This entry has not yet been fully updated (first published 1915; most recently modified version published online September 2021). < comb. form1836
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