15-letter words containing h, e, r, d, t, s
- 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.
- 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.
- under one's hat — a shaped covering for the head, usually with a crown and brim, especially for wear outdoors.
- 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
- warmheartedness — The quality of being warmhearted.
- 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