15-letter words starting with th
- thirtysomething — a person in her or his thirties
- thomas a becket — Saint Thomas à, 1118?–70, archbishop of Canterbury: murdered because of his opposition to Henry II's policies toward the church.
- thomas à kempis — Thomas à, 1379?–1471, German ecclesiastic and author.
- thorium dioxide — a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.
- thorndike's law — the principle that all learnt behaviour is regulated by rewards and punishments, proposed by Edward Lee Thorndike (1874–1949), US psychologist
- thought pattern — habitual way of thinking
- thought process — thinking, train of thought
- thought reading — mind reading.
- thoughtlessness — lacking in consideration for others; inconsiderate; tactless: a thoughtless remark.
- thousand island — of or relating to the Thousand Islands or their inhabitants
- thraco-phrygian — a hypothetical branch of Indo-European implying a special genetic affinity between the meagerly attested Thracian and Phrygian languages.
- three of a kind — a set of three cards of the same denomination.
- three-four time — music: 3/4 time signature
- three-line whip — A three-line whip is a situation where the MPs in a political party are ordered to attend parliament and vote in a particular way on a particular issue.
- threepennyworth — an amount having the value or price of threepence
- threshold price — the highest price a retailer is allowed to sell a particular good at
- thromboembolism — the blockage of a blood vessel by a thrombus carried through the bloodstream from its site of formation.
- through traffic — traffic which continues on a road or highway rather than crossing onto a different road
- throw overboard — to reject or abandon
- thunderstricken — Archaic. to strike with a thunderbolt.
- thursday island — an island in Torres Strait between NE Australia and New Guinea; part of Queensland: pearl fishing. 1½ sq. mi. (4 sq. km).
- thymidylic acid — a nucleotide consisting of thymine, deoxyribose, and a phosphate group. It is a constituent of DNA
- thyrocalcitonin — calcitonin
- thyroid extract — the powdered preparation made from the thyroid gland of certain animals, used to treat hypothyroidism
- thyroid hormone — A thyroid hormone is a hormone, especially thyroxine or triiodothyronine, produced by the thyroid gland.