tri-, tre-

1. The state of being threefold, threefoldness, threeness; a group consisting of three closely related members.
2. In theological use, applied to the existence of one God in three persons.
3. The three persons or modes of being of the Godhead as conceived in orthodox Christian belief; the Father, Son, and Holy Spirit as constituting one God; the triune God.

Belonging to or lasting three nights.

1. In math, consisting of three terms, as an algebraical expression.
2. In biology, relating to or consisting of three taxonomic names, denoting the genus, species, and subspecies or variety of an organism.
3. Of the names of married women (especially, in the U.S.): consisting of three elements, the given, maiden, and husband’s surname; also applied to those known by this style, whereby the maiden name is in some measure retained.
4. The name of a subspecies or variety when composed of three terms (the names of the genus, species, and subspecies or variety).

A system of nomenclature, as in biological classification, involving the use of trinomial terms.

1. A composition for three voices or instruments; also, a company of three performers singing or playing such a composition.
2. A group or set of three people.

A name consisting of three terms; a trinomial name in botany or zoology.

1. References to names which consist of three terms.
2. A trinomial name in botany or zoology.

A condition in which there are three testes.

Diprosopus in which three ears are present.

An oxide containing three oxygen atoms per molecule.

1. A woman who has had three pregnancies that have lasted beyond 20 weeks or that have produced an infant of at least 500 grams; also known astertipara.
2. A reference to a woman who has borne three children in separate pregnancies.

1. Divided into or composed of three parts or kinds; threefold, triple.
2. Involving, or of the nature of, division into three parts.
3. Relating to or executed by three parties; as, "a tripartite agreement".

Three feet; a three-legged animal; tripodal.

Having, or consisting of, three petals.