12-letter words containing a, x, i, s
- saint xystus — Saint, pope a.d. 432–440.
- sexagenarian — of the age of 60 years or between 60 and 70 years old.
- sextuplicate — a group, series, or set of six identical copies: The application is to be submitted in sextuplicate.
- six-yard box — On a football pitch, the six-yard box is the rectangular area marked in front of the goal.
- six-year-old — being six years in age
- sixth-grader — a pupil in their sixth US school year after kindergarten, who is usually around 11 or 12 years old
- submaxillary — of or relating to the lower jaw or lower jawbone.
- sulphadoxine — an antibiotic drug of the sulphonamide group, commonly used in combination with pyrimethamine to treat malaria, and in combination with various drugs to treat certain infections
- supermaxilla — the upper jaw.
- tax increase — an increase in the amount of tax that people and companies are obliged to pay
- the fair sex — women collectively
- toxocariasis — the infection of humans with the larvae of a genus of roundworms, Toxocara, of dogs and cats. It can cause swelling of the liver and, sometimes, damage to the eyes
- trophallaxis — (among social insects) the exchange of nutriments or other secretions between members of a colony.
- unexhaustive — exhausting a subject, topic, etc.; comprehensive; thorough: He published an exhaustive study of Greek vases.
- unisexuality — of or relating to one sex only.