tri-, tre-

Having three flagella, as observed in certain protozoan organisms.

Occurring every three months.

A compound, complex, or structure made up of three components.

1. Having three similar segments or parts.
2. In botany, having flower parts, such as petals, sepals, and stamens, in sets of three.

1. A period or term of three months; specifically, each of three such periods into which human gestation (from conception to birth) is divided:

1. First trimester, the first three months of pregnancy.
2. Second trimester, the middle three months of pregnancy.
3. Third trimester, the third and final three months of pregnancy.

2. One of the three terms into which the academic year is divided by some U.S. Colleges, schools, universities; as well as, some educational systems in other parts of the world.

Consisting of or containing three months; occurring or appearing every three months; a quarterly publication.

A line of poetic verse consisting of three metrical feet.

1. Occurring every three months.
2. Lasting or extending over three months.

1. Having flowers with pistils and stamens of three different relative lengths.
2. In zoology, exhibiting three different forms (colorations, etc.) in different individuals of a species, or of a colony of polyps.

1. A condition in which there are three distinct forms; such as, a plant or an insect.
2. Existence under three forms, as in holometabolous insects that pass through larval, pupal, and imago stages.

Existing under three forms; marked by trimorphism.

Having three parts; threefold.

1. Threefold; triple; ternary.
2. Consisting of three parts or proceeding by threes.

1. In heraldry, a group of three, especially three animals, in a bearing.
2. Threefold; triple.

Someone who believes in the Christian doctrine of the Trinity or the union of three divine persons, the Father, the Son, and the Holy Spirit all of which exist as one God.