tetra-, tetr-

(Greek: four; a number used as a prefix)

tetractine, tetraxon (s) (noun); tetractines; tetraxons (pl)
A spicule of four equal and similar rays; tetract: The four tetractines of a sponge meet at equal angles.
1. A group of four things with something in common.
2. An element having a valence or combining a power of four.
3. A group, or series, of four similar bodies, things, or people.
4. The cardinal number that is the sum of three and one.
5. A group of four parts, referring to cells produced by division in two planes, or of a chromosome in four parts in preparation for two mitotic divisions in maturation.
Having only four fingers or toes on a hand or foot.
1. Having four digits or claws on each extremity.
2. Having, or characterized by, four digits on a foot or hand.
1. Having four digits on a limb, as with amphibians and many birds.
2. People having just four digits on a hand or foot.
Having fourteen feet; belonging to the Tetradecapoda, an order of Crustaceans.
tetradenous (adjective), more tetradenous, most tetradenous
Inflammation of the tarsal borders of the eyelids and meibomian glands: Meg's eyes were sore, red, and tender, and her ophthalmologist diagnosed her condition as being tetradenous which affected the dense connective tissue that stiffens the eyelids and the sebaceous glands in the eyelids.
tetragamy, tetragamous
1. A fourth marriage.
2. Marriage with four spouses simultaneously.

Cross references of word families that are related, partially or totally, to: "four, fourth": quadri-; quatr-; tessara-.