Tetragoniaceae
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～ succulent herbs or small shrubs mostly of South Africa but also New Zealand and North America: carpetweeds; fig marigolds
Tetragonia tetragonioides
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～ coarse sprawling Australasian plant with red or yellow flowers; cultivated for its edible young shoots and succulent leaves
Tetragonurus
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～ a genus of Stromateidae
tetragram
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～ a word that is written with four letters in an alphabetic writing system
tetragrammaton
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～ four Hebrew letters usually transliterated as YHWH (Yahweh) or JHVH (Jehovah) signifying the Hebrew name for God which the Jews regarded as too holy to pronounce
tetrahalide
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～ any halide containing four halogen atoms in its molecules
tetrahedron
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～ any polyhedron having four plane faces
tetrahydrocannabinol
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～ psychoactive substance present in marijuana
tetrahymena
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～ relative of the paramecium; often used in genetics research
tetraiodothyronine
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～ hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine"
tetralogy of Fallot
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～ a congenital heart defect producing cyanosis; characterized by four symptoms: pulmonary stenosis and ventricular septal defect and malposition of the aorta over both ventricles and hypertrophy of the right ventricle
tetralogy
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～ a series of four related works (plays or operas or novels)
tetrameter
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～ a verse line having four metrical feet
tetramethyldiarsine
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～ a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air
Tetraneuris grandiflora
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～ whitish hairy plant with featherlike leaves and a few stout stems each bearing an especially handsome solitary large yellow flower head; mountainous regions north central United States
Tetraneuris acaulis
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～ perennial having tufted basal leaves and short leafless stalks each bearing a solitary yellow flower head; dry hillsides and plains of west central North America
Tetraneuris
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～ genus of hairy yellow-flowered plants of the western United States
tetranychid
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～ web-spinning mite that attacks garden plants and fruit trees
tetranychidae
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～ plant-feeding mites
Tetrao
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～ type genus of the Tetraonidae: capercaillies