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

tetˈraploidy noun

The condition of being tetraploid

tetˈrapod /-pod/ noun

1. (Gr tetrapous four-footed, from pous, podos foot) a four-footed animal
2. Any vertebrate above the fishes
3. A reinforced-concrete block laid against a sea wall to break the force of the waves
4. A structure with four supporting arms at 120º to each other radiating from a central point, three arms supporting the structure at any one time, with the fourth vertical

(of an animal or structure) having four feet

tetrapodˈic adjective

(of verse) having four metrical feet

• irregularly
• irregulars
• irrelated
• irrelation
• irrelations
• irrelative
• irrelatively
• irrelativeness
• irrelativenesses
• irrelevance
• irrelevances
• irrelevancies
• irrelevancy
• irrelevant
• irrelevantly
• irreligion
• irreligionist
• irreligionists
• irreligions
• irreligious
• irreligiously
• irreligiousness
• irreligiousnesses
• irremeable
• irremeably