15-letter words containing t, h, i, r, d, s
- sphaerosiderite — a type of siderite
- spheroidization — the conversion of grains into spheroids
- standing charge — fixed energy costs
- starting handle — a crank used to start the motor of an automobile.
- straight-backed — having a straight, usually high, back: a straight-backed chair.
- straightforward — going or directed straight ahead: a straightforward gaze.
- strawberry dish — a shallow, circular fruit dish with a fluted or pierced border.
- the cordilleras — the complex of mountain ranges on the W side of the Americas, extending from Alaska to Cape Horn and including the Andes and the Rocky Mountains
- the disappeared — people who have been arrested secretly or abuducted and presumably imprisoned or killed
- the first-named — something that is specified or named first
- the undersigned — the person or persons who have signed at the foot of a document, statement, etc
- thermodiffusion — thermal diffusion.
- thermoperiodism — the effect on an organism of rhythmic fluctuations in temperature.
- third dimension — the additional dimension by which a solid object is distinguished from a planar projection of itself or from any planar object.
- thorndike's law — the principle that all learnt behaviour is regulated by rewards and punishments, proposed by Edward Lee Thorndike (1874–1949), US psychologist
- threshold price — the highest price a retailer is allowed to sell a particular good at
- 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).
- tristram shandy — a novel (1759–67) by Laurence Sterne.
- turkish delight — a candy made of fruit juice and gelatin, cubed and dusted with sugar.
- two-thirds rule — a former rule in the Democratic Party, effective 1832–1936, requiring a vote of at least two thirds of its national convention delegates to nominate a presidential and vice-presidential candidate.
- vortex shedding — the process by which vortices formed continuously by the aerodynamic conditions associated with a solid body in a gas or air stream are carried downstream by the flow in the form of a vortex street
- winchester disk — a hard disk that is permanently mounted in its unit.
- winter holidays — a period of rest from work or studies taken in winter
- withdrawal slip — a small paper form which has to be filled in before making a withdrawal of money from a bank, building society, etc