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Comprehensive
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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]
tic an involuntary spasmodic contraction or twitching of muscles, usu. in the face or extremities, that may occur habitually or in times of stress.
tic douloureux painful tic (French); an affliction marked by painful, darting paroxysms and muscular twitches of the face.
tick1 a recurrent small sharp clicking sound, esp. that of a clock or timing mechanism. [7 definitions]
tick2 any of numerous parasitic bloodsucking arachnids related to spiders and mites, that attach themselves to warm-blooded animals and are in some cases carriers of infectious diseases.
tick3 the cloth casing for a mattress or pillow.