What is another word for tris-?
Pronunciation: [tɹˈɪs] (IPA) 
The prefix "tris-" comes from the Greek word "treis", meaning "three". It is often used to indicate the presence of three or a multiple of three of something. A synonym for the prefix "tris-" is "tri-", which is commonly used in words such as "triangle", "triple", and "trisect". Other possible synonyms for "tris-" include "ter-" and "tres-", both meaning "three". These prefixes are used in words like "terrace", "tertiary", and "trespass". Overall, the use of these different prefixes provides a range of options for indicating the presence of three or a multiple of three.
