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tri-
- a combining form meaning “three,” used in the formation of compound words:
triacid; triatomic.
tri-
prefix
- three or thrice
trigon
triaxial
trisect
- occurring every three
trimonthly
Word History and Origins
Word History and Origins
Origin of tri-1
Example Sentences
Since then, competitions such as the Tri and Four Nations have replaced genuine Test series with the Aussies.
With the help of a mysterious glowing ball of energy named Tri, Zelda is gifted the ability to travel into these rifts and heal them.
El Tri has won fewer than half its games since Qatar, was eliminated in the first round of this summer’s Copa América and drew just 25,271 for last week’s Rose Bowl match against New Zealand, its smallest crowd for a U.S. friendly in nearly three years.
They’ll be together on the Mexican bench for the first time Saturday when El Tri faces New Zealand at the Rose Bowl.
Trained as a rifleman, Anderson found himself in Vietnam’s Quang Tri province.
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Words That Use Tri-
What does tri- mean?
Tri- is a combining form used like a prefix meaning “three.” Tri- is often used in a great variety of both everyday and technical terms.
Tri- ultimately comes from both Greek treîs, tría and Latin trēs, tria, all of which mean “three.”
Examples of tri-
An example of a word you may have encountered that features tri- is trident, “a three-pronged instrument or weapon.” The word trident comes from Latin tridēns, which uses the equivalent of the form tri- in the language.
The tri- part of the word means “three,” while the -dent part means “tooth.” Trident literally translates to “three teeth” or “three-toothed.”
Tri- also features in common words such as triangle and tricycle. Learn more about the origins of these words at their entries.
What are some words that use the combining form tri-?
- triaxial
- tridimensional
- tridymite (using the equivalent form of tri- in Greek)
- triethyl
- trifacial
- trifocal
- trifold
- trigram
- trihedral
- trihydrate
- trihydroxy
The following words use the equivalent forms of tri- in Latin or Greek:
- triad
- triarchy
- triceps
- tridactyl
- tridentate
- triduum
- triennial
- trifolium
- triform
- trigamy
- triglyph
- trigone
- trimeter
- triplex
- tripod
- tritoma
What are some other forms that tri- may be commonly confused with?
Not every word that begins with the letters tri- is necessarily using the combining form tri- to denote “three.” Learn why triage literally means “sorting” at our entry for the word.
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