tetra- or tetr- /tet-r(ə)-, ti-tr(a)-/

Denoting four

tetrabaˈsic adjective (chem)

1. Capable of reacting with four equivalents of an acid
2. (of acids) having four replaceable hydrogen atoms

tetrabasicity /tet-rə-bā-sisˈi-ti/ noun

Tetrabranchia or Tetrabranchiata /-brangˈki-ə, -ki-āˈtə/ plural noun

(Gr branchia gills) a former order of the nautilus subclass of cephalopods, with four gills

tetrabranchˈiate adjective

Four-gilled

Any mollusc belonging to the Tetrabranchia

tetrachloˈride noun

Any compound with four chlorine atoms per molecule

tetrachloroethˈylene or tetrachlorethˈylene noun

C₂H₂Cl₄, a liquid used in dry-cleaning, as a solvent, etc (also called tetrachlorethˈane)

tetrachlorōmēˈthane noun

Carbon tetrachloride

tetˈrachord /-körd/ noun

1. (Gr chordē string) a four-stringed instrument
2. A series of four sounds, forming a scale of two tones and a half

tetrachordˈal adjective

tetrachotˈomous adjective

tetrachotomy /-kotˈə-mi/ noun

(Gr tetracha in four parts, and -tomia a cutting) division in fours

tetracˈid adjective

1. Having four replaceable hydrogen atoms
2. Capable of replacing four hydrogen atoms of an acid

tetract /tetˈrakt/ adjective

(Gr aktīs, -īnos ray) four-rayed

A four-rayed sponge spicule

tetractˈinal (or /-īˈnəl/) or tetracˈtine adjective

Tetractinellˈida plural noun

An order of sponges in which some of the spicules are four-rayed

tetracyclic /-sīˈklik/ adjective

1. (Gr kyklos ring, wheel) of, in or with four whorls or rings
2. (of a compound) having four fused hydrocarbon rings in its molecular structure (chem)

tetracyˈcline noun

A crystalline antibiotic used to treat a wide range of infections, esp of the respiratory and urinary tracts

tetrad /tetˈrad/ noun

1. A group of four
2. An atom, radical or element having a combining power of four (chem)

tetˈrad or tetradˈic adjective

tetradactyl /-dakˈtil/ adjective (Gr daktylos digit; zoology)

1. Four-fingered
2. Four-toed

A four-toed animal

tetradacˈtylous adjective

Having four fingers or toes

tetradacˈtyly noun

The condition of being tetradactylous

tetˈradite noun

1. A person who attaches mystic properties to the number four
2. A believer in a godhead of four persons

tetˈradrachm /-dram/ noun

An ancient Greek coin worth four drachmas

tetradymite /ti-tradˈi-mīt/ noun

(Gr tetradymos fourfold) a grey metallic mineral, an ore of tellurium, Bi₂Te₂S

Tetradynamia /-di-nāˈmi-ə/ plural noun

(in Linnaeus's system) a class corresponding to the Cruciferae

tetradynamous /-dinˈə-məs/ adjective

(Gr dynamis power) having four long stamens in pairs and two short, as in the Cruciferae

tetraethyl /-ēthˈīl, -eˈthil/ adjective

Having four ethyl groups, as tetraethyl lead or lead tetraethyl, Pb(C₂H₅)₄, a compound formerly added to petrol as an antiknock agent

tetrafluoroethˈylene noun

A dense colourless gas that is polymerized to make polytetrafluoroethylene

tetˈragon /-gən, -gon/ noun

(see -gon) a plane figure of four angles and four sides

tetragonal /-ragˈə-nəl/ adjective

1. Having the form of a tetragon
2. Referable to three axes at right angles, two of them equal (crystallography)

tetragˈonally adverb

tetragˈonous adjective (botany)

With four angles and convex faces

tetˈragram /-gram/ noun

1. (Gr gramma a letter) a word or inscription of four letters
2. (also with cap) the tetragrammaton
3. A (complete) quadrilateral (geometry)

tetragrammˈaton noun

1. (also with cap) vocalized as the name YaHWeH, JeHoVaH, etc, as written with four Hebrew letters, regarded as a mystic symbol
2. Any other sacred word of four letters, as the Latin Deus

Tetragynia /-jinˈi-ə/ plural noun

(see gyn-) (in the Linnaean system) an order of plants (in various classes) with four pistils

tetragynˈian or tetragynous /-rajˈi-nəs/ adjective

tetrahēˈdral adjective

Of, relating to, like or in the form of a tetrahedron

tetrahēˈdrally adverb

tetrahēˈdrite noun

Grey copper ore, sulphide of copper and antimony often occurring in tetrahedral crystals

tetrahedron /-hēˈdrən/ noun (pl tetrahēˈdrons or tetrahēdra /-drə/)

1. (Gr hedrā a base) a solid figure or body with four plane faces
2. (in full, regular tetrahedron) a tetrahedron whose surfaces are equilateral triangles

tetrahydrocannˈabinol noun

The main intoxicant substance in marijuana

tetrahydrofōˈlate noun

Folic acid, vitamin B₇

tetrahydrogestrinone /-jestˈri-nōn/ noun

A synthetic steroid, illegally used as a performance-enhancing drug by some athletes (abbrev THG)

tetrakishexahēˈdron noun

(Gr tetrakis four times) a figure formed by erecting equal pyramids on all the faces of a cube

tetralˈogy noun

1. (Gr tetralogiā) (in ancient Greece) a group of four dramas, usu three tragic and one satyric
2. Any series of four related dramatic or operatic works or stories

tetramˈeral adjective

Four-parted

tetramˈerism noun

Division into four parts

tetramˈerous adjective

(Gr meros part) having four parts, or parts in fours

tetrameter /ti-tramˈi-tər/ noun

(Gr metron measure) a line of a verse of four measures (dipodies or feet)

Tetˈramorph noun

A pictorial representation of the symbolic attributes of the four evangelists combined in a single figure

tetramorˈphic adjective

(see morphic) having four forms

Tetranˈdria plural noun

(in Linnaeus's classification) a class of plants with four stamens

tetranˈdrian adjective

tetranˈdrous adjective

(Gr anēr, andros man; in the sense of male) having four stamens

tetrapla /tetˈrə-plə/ noun

(Gr neuter pl of tetraploos fourfold) an edition of four parallel texts, esp Origen's of the Old Testament

tetraplēˈgia noun

Quadriplegia

tetraplēˈgic adjective

tetraploid /tetˈrə-ploid/ adjective

(Gr tetraploos fourfold, and eidos form) of cells, nuclei or organisms, having four times the haploid (twice the normal) number of chromosomes

A tetraploid organism, cell or nucleus

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