tri-, tre-
(Greek > Latin: three, thrice, threefold; a numerical prefix)
Triangulum
An ancient constellation shaped like an equilateral triangle.
triannual
1. Occurring every three years; lasting for three years; equal to triennial.
2. Occurring three times a year.
trianthous
Having three flowers.
triapsidal
Having three apses, as most Greek churches.
triarch
The ruler of one of three divisions of a country or territory.
triarchy
1. The government or jurisdiction of a triarch; one of three divisions of a country ruled by triarchs.
2. Government by three rulers or powers jointly; three persons associated in government, a triumvirate.
3. A group of three districts or divisions of a country each under its own ruler.
Triassic
In geology, the lowest of three major divisions of fossiliferous rocks which together make up the Mesozoic or Secondary series, namely: Triassic; Jurassic; and Cretaceous.
It lies above the Permian and below the Jurassic.
triathlon
1. An athletic or sporting contest composed of three different events.
2. An intense athletic-endurance competition in which all participants must complete an ocean swim, a bicycle ride, and a long-distance run.
tribrachial
A figure or utensil with three arms, especially a three-branched flint.
tribrachius
A deformed fetus, usually conjoined twins, having three arms.
tribrachteatel
In botany, having three bracts.
Tribus unum.
From three, one.
Motto of Trinity University, San Antonio, Texas, USA.
tricameral
A reference to a legislature composed of three chambers.
tricennial
1. Pertaining to thirty years.
2. Consisting of thirty years.
3. Occurring once in every thirty years.
4. Etymology: from Latin tricennium, "thirty years"; from triginta "thirty" + annus, "year" (tricennalis).
tricentenarian
A person who is three-hundred years old.
Cross references of word families that are related, partially or totally, to: "three, third":
terce-;
terti-;
trigono-;
trito-.
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