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Definition of Tris-
1. 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: '''''tris'''phosphuret of copper'' is PCu'''3'''; '''tris'''benzeneazoresorcinol, C6H(OH)2(N2Ph)'''3'''. ¹
2. Prefix. (chemistry) A variant of tri-, used for substitutions of three complex rather than simple units, as in, ¹
¹ Source: wiktionary.com
Medical Definition of Tris-
1.