tri-, tre-

(Greek > Latin: a numerical prefix meaning, three, thrice, threefold; triple; a word element for number 3)

triskaidekaphobia (s) (noun) (no plural)
1. A dread of the number thirteen: Jim was told by his psychiatrist that his irrational fear of the digit between twelve and fourteen was called triskaidekaphobia.
2. Etymology: from Greek treiskaideka, “thirteen”; from treis, "three"; kai, "and"; deka, "ten" + -phobia, "fear".
A fear of the number 13.
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Fear of 13.

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tristichia
Presence of three rows of eyelashes.
tristichous
A term used to describe an arrangement of leaves in which successive leaves arise one-third of the way around the stem from the previous leaf, thus forming three rows up the stem.
trisulcate
Marked by three grooves.
trisyllable, trisyllabic, trisyllabical
Containing three syllables; such as, the word syllable.
tritagonist (s) (noun), tritagonists (pl)
In ancient Greek drama, the third actor, whose part is usually that of the evil genius or as a promoter of the sufferings of the protagonist: In his lively readings of ancient Greek dramas, Dr. Cooper used a shrill voice when he represented the tritagonist talking.
tritanopia (s) (noun), tritanopias (pl)
1. A rare condition in which perception of blue and green becomes confused: Tritanopia is a result of the absence of the blue-sensitive pigment in the cone cells of the retina.
2. A visual defect in which the retina fails to respond to the color blue: Due to his tritanopia, Lord Allton, the artist, worked in black and white, avoiding the use of any warm tones in his paintings.
3. Etymology: from Greek tritos, "third" + anopia, "blindness". Based on the idea of not seeing a third of the color spectrum.
tritaph (s) (noun), tritaphs (pl)
A group of three cists, or chambers, in a prehistoric tomb: The explorers, lead by Sir Alfred, were excited when they discovered the tritaph in the ancient desert tomb they had uncovered.
tritheism (s) (noun), tritheisms (pl)
Belief in three gods, especially the belief or doctrine that the Christian Trinity of Father, Son, and Holy Spirit consist of three distinct divinities or three separate gods: Because her neighbors were sensitive about religious matters, Dahlia did not tell them about her belief in tritheism.
tritheist (s) (noun), tritheists (pl)
A person who believes that the three persons of the Christian Trinity are three separate gods: Tritheists have a belief that the Father, Son, and Holy Spirit are three distinct deities, which is considered contrary to the established teachings of orthodox Christianity.
tritheocracy (s) (noun), tritheocracies (pl)
A rule or government by three spirits; a group of three divine beings exercising joint rule: The astonished townspeople watched the three volcanoes erupt in the distance and believed it was the gods of the tritheocracy arguing and throwing fire and stones at each other.
tritone (s) (noun), tritones (pl)
An interval composed of three whole musical notes: The tritone derives its name from the fact that it spans three whole tones and it refers to any musical interval of six semitones.

Two tritones add up to six whole tones, or twelve semitones, which usually produce a perfect octave.

tritozooid (s) (noun), tritozoids (pl)
An individual invertebrate animal that reproduces non-sexually by budding or splitting; especially, one that lives in a colony in which each member is joined to others by living material; for example, a coral: When visiting Australia, Kitty arranged to visit the Great Coral Reef which she knew was comprised of millions of tritozooids.

triumvir
Three men.

In ancient Rome, one of a group of three men acting as joint magistrates for some special purpose or function. In Roman history the most famous triumvirate was that of Octavian, Anthony (Antony), and Lepidus in 43 B.C., which was known as the Second Triumvirate to distinguish it from the combination of Caesar, Pompey, and Crassus in 60 B.C., which is known as the First Triumvirate.

triumviracy
In Roman history, one of three magistrates or public officers forming a committee charged with one of the departments of the administration; also, a member of the coalition of Pompey, Caesar, and Crassus, 60 B.C. (first triumvirate), or of the administration of Caesar, Antony, and Lepidus, 43 B.C. (second triumvirate).

Cross references of word families that are related, partially or totally, to: "three, third": terce-; terti-; trigono-; trito-.