tris-

Chemistry, Natural sciences, Physical sciences Morpheme, 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, Natural sciences, Physical sciences Morpheme A variant of tri-, used for substitutions of three complex rather than simple units, as in,