12-letter words containing x, s, t
- opposite sex — man if woman, woman if man
- oxidant smog — photochemical smog.
- pansexualist — someone who is pansexual
- pansexuality — Psychiatry. pertaining to the theory that all human behavior is based on sexuality.
- perplexities — the state of being perplexed; confusion; uncertainty.
- postexercise — bodily or mental exertion, especially for the sake of training or improvement of health: Walking is good exercise.
- postexposure — occurring after a photo or image has been taken
- pre-existing — to exist beforehand.
- protosynthex — A query system for English text.
- proximities' — nearness in place, time, order, occurrence, or relation.
- punxsutawney — a town in central Pennsylvania: Groundhog Day celebration.
- purchase tax — a sales tax on nonessential and luxury goods.
- saint sixtus — Saint, pope a.d. 432–440.
- saint xystus — Saint, pope a.d. 432–440.
- sandbox tree — a tropical American tree, Hura crepitans, of the spurge family, bearing a furrowed, roundish fruit about the size of an orange that when ripe and dry bursts with a sharp report and scatters the seeds.
- self-excited — noting a generator with magnets that are excited by the current it produces.
- serotaxonomy — the study of the taxonomy of proteins using serological methods
- sex-positive — explicitly stated, stipulated, or expressed: a positive acceptance of the agreement.
- sexcentenary — pertaining to 600 or a period of 600 years; marking the completion of 600 years.
- sextuplicate — a group, series, or set of six identical copies: The application is to be submitted in sextuplicate.
- shooting box — a small house or lodge for use during the shooting season.
- six counties — the historic counties of Northern Ireland, which no longer have a local government function
- sixteenpenny — noting a nail 3½ inches (9 cm) long. Symbol: 16d.
- sixth column — the persons residing in a country at war who are devoted to aiding the fifth column in its activities, especially by lowering morale, spreading rumors, etc.
- sixth former — student: 16-18
- sixth-grader — a pupil in their sixth US school year after kindergarten, who is usually around 11 or 12 years old
- sixty-eighth — next after the sixty-seventh; being the ordinal number for 68.
- sixty-fourmo — a book size (about 2 × 3 inches; 5 × 7 cm) determined by printing on sheets folded to form 64 leaves or 128 pages.
- sixty-fourth — next after the sixty-third; being the ordinal number for 64.
- sixty-second — next after the sixty-first; being the ordinal number for 62.
- stuffing box — a device for preventing leakage of gases or liquids along a moving rod or shaft at the point at which it leaves a cylinder, tank, ship hull, etc.
- tax increase — an increase in the amount of tax that people and companies are obliged to pay
- texas ranger — a member of the Texas state police force or, especially formerly, of the mounted state police.
- text message — an electronic message sent over a cellular network from one cell phone to another by typing words, often in shortened form, as “l8t” for “late,” on the phone's numeric or QWERTY keypad.
- the fair sex — women collectively
- thirty-sixth — next after the thirty-fifth; being the ordinal number for 36.
- 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
- trans-sexual — a person having a strong desire to assume the physical characteristics and gender role of the opposite sex.
- transfer box — A transfer box is a gear system that divides the power between the front and rear axles of a four-wheel drive system.
- transfer tax — a transaction fee imposed on the transfer of title to property
- trophallaxis — (among social insects) the exchange of nutriments or other secretions between members of a colony.
- twenty-sixer — a liquor bottle of around 26 ounces (0.750 litre) capacity
- twenty-sixth — next after the twenty-fifth; being the ordinal number for 26.
- unexhaustive — exhausting a subject, topic, etc.; comprehensive; thorough: He published an exhaustive study of Greek vases.
- unisexuality — of or relating to one sex only.
- voix celeste — an organ stop having for each note two pipes tuned to slightly different pitches and producing a wavering, gentle tone.
- x consortium — A vendor consortium supporting development, evolution and maintenance of the X Window System. The X Consortium is an independent, not-for-profit company. It was formed in 1993 as the successor to the MIT X Consortium, a research group of the MIT Laboratory for Computer Science.
- xanthomatous — of, relating to, or marked by xanthoma
- xenoestrogen — (biochemistry) A xenohormone that imitates estrogen.
- xiphisternum — The lowest part of the sternum; the xiphoid process.