Meaning of tris- | Babel Free

Definitions

1. 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.
   morpheme, obsolete
2. A variant of tri-, used for substitutions of three complex rather than simple units, as in,
   morpheme

Examples

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

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

CEFR level