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thymine a white crystalline organic base that is an essential component of DNA.
thymol a white crystalline aromatic solid derived from thyme oil or synthesized and used in mouthwashes and nasal sprays, perfumes, and preservatives.
thymosin any of several hormones secreted by the thymus that stimulate the immune system by promoting the development of T cells.
thymus a vestigial ductless gland or glandular structure found in vertebrates, usu. at the base of the neck, that is active during childhood in modifying white blood cells and building resistance to disease, but becomes inactive in the adult.
thyristor any of several electronic devices, esp. a silicon-controlled rectifier, that convert alternating current to direct current.
thyro- thyroid.
thyroid of, pertaining to, or affecting the thyroid gland. [5 definitions]
thyroidectomy a surgical operation in which all or part of the thyroid gland is removed.
thyroid gland a two-lobed endocrine gland that is located on both sides of the trachea, with a slender connecting tissue, and that produces secretions that control growth and metabolism.
thyrotropin a hormone secreted by the anterior pituitary that stimulates and regulates the development and secretion of thyroxine.
thyroxine the thyroid hormone that contains iodine and regulates metabolism, or a synthetic preparation of the same compound used to treat thyroid disorders.
thyrsus a branched flower cluster, as of the lilac, in which the main stem does not terminate in a flower but the lateral stems do.
thyself the reflexive form of thou (used chiefly in earlier literature and religious writing); yourself.
Ti symbol of the chemical element titanium.
ti1 in music, the syllable that denotes the seventh tone of a diatonic scale. (See sol-fa.) [2 definitions]
ti2 any of several tropical plants resembling a palm, found in Asia and the Pacific, with long, narrow leaves growing in a tuft at the top.
Tiananmen Square an extensive public plaza in central Beijing, China, known widely in connection with the student protests of 1989.
tiara a crescent-shaped, usu. jewelled crown worn as an ornament by women on formal occasions. [2 definitions]
Tibet an autonomous region of southwestern China on a high plateau north of the Himalayas, noted as a center for Buddhism since the 7th century.
Tibetan of or pertaining to Tibet or its people, culture, language, or the like. [3 definitions]
tibia the inner and larger bone of the human leg between the knee and the ankle; shinbone. [2 definitions]