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.

tris- /trɪs/ prefix.

ORIGIN: Greek, from tris thrice.

Thrice, threefold; spec. in Chemistry, forming names of compounds containing three groups identically substituted or coordinated. Cf. bis-, tetrakis-.

DERIVATIVE trisazo /trɪˈsazəʊ, trɪˈseɪzəʊ/ adjective containing three azo groups in the molecule E20.
trisoctaˈhedron noun, pl. -dra, -drons, Geometry & Crystallography a solid figure having 24 faces, every three of which correspond to one face of an octahedron M19.

tris-
\(|)tris\ prefix
Etymology: Greek, from tris, from treis three — more at three
: thrice : tripled
< tristetrahedron >
— especially in complex chemical expressions
< tris-(2-chloroethyl)-amine >

tris-

Prefix

chemistry, obsolete A variant of tri- used to indicate that the component that does not take the prefix occurs three times in the compound: trisphosphuret of copper is PCu₃; trisbenzeneazoresorcinol, C₆H(OH)₂(N₂Ph)₃.
chemistry A variant of tri-, used for substitutions of three complex rather than simple units, as in,

trisbenzene-azophenol, C₆H₂(N:NC₆H₅)₃OH

tristhio-dimethyl-benzaldehyde, {C₆H₃(CH₃)₂CHS}₃

Etymology

Greek τρις thrice

Related terms

bis-

tetrakis-

词汇	tris-
词根词缀	OED SOED Webster Wiktionary 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. tris- /trɪs/ prefix. ORIGIN: Greek, from tris thrice. Thrice, threefold; spec. in Chemistry, forming names of compounds containing three groups identically substituted or coordinated. Cf. bis-, tetrakis-. DERIVATIVE trisazo /trɪˈsazəʊ, trɪˈseɪzəʊ/ adjective containing three azo groups in the molecule E20. trisoctaˈhedron noun, pl. -dra, -drons, Geometry & Crystallography a solid figure having 24 faces, every three of which correspond to one face of an octahedron M19. tris-* \(\|)tris\ prefix Etymology: Greek, from tris, from treis three — more at three : thrice : tripled < tristetrahedron > — especially in complex chemical expressions < tris-(2-chloroethyl)-amine > tris- Prefix chemistry, obsolete A variant of tri- used to indicate that the component that does not take the prefix occurs three times in the compound: trisphosphuret of copper is PCu₃; trisbenzeneazoresorcinol, C₆H(OH)₂(N₂Ph)₃. chemistry A variant of tri-, used for substitutions of three complex rather than simple units, as in, trisbenzene-azophenol, C₆H₂(N:NC₆H₅)₃OH tristhio-dimethyl-benzaldehyde, {C₆H₃(CH₃)₂CHS}₃ Etymology Greek τρις thrice Related terms bis- tetrakis-
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