tetrahedron
— Noun
– English
～ any polyhedron having four plane faces
tetrahydrocannabinol
— Noun
– English
～ psychoactive substance present in marijuana
tetrahymena
— Noun
– English
～ relative of the paramecium; often used in genetics research
tetraiodothyronine
— Noun
– English
～ hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine"
tetralogy of Fallot
— Noun
– English
～ 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
— Noun
– English
～ a series of four related works (plays or operas or novels)
tetramerous
— Adjective
– English
～ having or consisting of four similar parts; tetramerous flowers
tetrameter
— Noun
– English
～ a verse line having four metrical feet
tetramethyldiarsine
— Noun
– English
～ a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air
tetrametric
— Adjective
– English
～ of or relating to verse lines written in tetrameter
Tetraneuris grandiflora
— Noun
– English
～ 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
— Noun
– English
～ 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
— Noun
– English
～ genus of hairy yellow-flowered plants of the western United States
tetranychid
— Noun
– English
～ web-spinning mite that attacks garden plants and fruit trees
tetranychidae
— Noun
– English
～ plant-feeding mites
Tetrao
— Noun
– English
～ type genus of the Tetraonidae: capercaillies