13-letter words containing a, s, p, o
- tachistoscope — an apparatus for use in exposing visual stimuli, as pictures, letters, or words, for an extremely brief period, used chiefly to assess visual perception or to increase reading speed.
- tapestry moth — carpet moth.
- taphrogenesis — the process of forming rifts, resulting in regional faulting and subsidence
- tauromorphous — having the form of a bull
- tax inspector — a government official whose job is to make sure that people and companies are paying the right amount of tax
- temporariness — lasting, existing, serving, or effective for a time only; not permanent: a temporary need; a temporary job.
- terminal post — A terminal post is the terminal on a battery to which the battery lead is attached.
- terpsichorean — pertaining to dancing.
- tetrapetalous — having four petals.
- the antipodes — Australia and New Zealand
- the pants off — If someone bores, charms, or scares the pants off you, for example, they bore, charm, or scare you a lot.
- the pole star — the star closest to the N celestial pole at any particular time. At present this is Polaris, but it will eventually be replaced by some other star owing to precession of the earth's axis
- the-spectator — a weekly periodical (1711–12, 1714) issued by Joseph Addison and Richard Steele.
- theanthropism — the doctrine of the union of the divine and human natures, especially the manifestation of God as man in Christ.
- thermoplastic — soft and pliable when heated, as some plastics, without any change of the inherent properties.
- thespian lion — a lion that attacked the flocks of Amphitryon and was killed by Hercules.
- thiophosphate — a salt or ester of thiophosphoric acid.
- thoracoplasty — the operation removing selected portions of the ribs to collapse part of the underlying lung or an abnormal pleural space, usually in the treatment of tuberculosis.
- thysanopteran — Also, thysanopterous. belonging or pertaining to the insect order Thysanoptera, comprising the thrips.
- thysanopteron — thysanopteran.
- tip one's hat — to take off, raise, or touch one's hat in salutation
- to go apeshit — to become crazy, enraged, or out of control
- topoisomerase — any of a class of enzymes that control the coiling of DNA molecules
- total eclipse — an eclipse in which the surface of the eclipsed body is completely obscured.
- total impulse — a measure of the maximum momentum that a given reaction engine and fuel supply can impart to a vehicle.
- townsend plan — a pension plan, proposed in the U.S. in 1934 but never passed by Congress, that would have awarded $200 monthly to persons over 60 who were no longer gainfully employed, provided that such allowance was spent in the U.S. within 30 days.
- toxicophagous — poison-eating
- toxoplasmosis — infection with the parasite Toxoplasma gondii, transmitted to humans by consumption of insufficiently cooked meat containing the parasite or by contact with contaminated cats or their feces: the illness produced is usually mild, but in pregnant women may damage the fetus.
- tracheophytes — any plant of the former division Tracheophyta, comprising all the vascular plants.
- trachycarpous — having rough-skinned fruit.
- train spotter — a person who collects the numbers of railway locomotives
- trainspotting — hobby: observing trains
- transcription — the act or process of transcribing.
- transcriptome — a collection of all the messenger RNA in a particular cell
- transpersonal — extending beyond or transcending the personal.
- transpiration — an action or instance of transpiring.
- transportedly — in a passionate or rapturous manner
- transposition — an act of transposing.
- treponemiasis — infection with treponema; syphilis.
- triploblastic — having three primary germ layers, as the embryos of vertebrates.
- tropical fish — any of numerous small, usually brightly colored fishes, indigenous to the tropics, and often kept and bred in home aquariums.
- trust company — a company or corporation organized to exercise the functions of a trustee, but usually engaging also in other banking and financial activities.
- tympanoplasty — reconstruction of the eardrum and the bones of the middle ear.
- un-personable — of pleasing personal appearance; handsome or comely; attractive.
- uncompensated — to recompense for something: They gave him ten dollars to compensate him for his trouble.
- uncomplaisant — not eager to please; not compliant or obliging
- unencompassed — to form a circle about; encircle; surround: He built a moat to encompass the castle.
- unimpassioned — not filled with passion or affected by strong emotion
- unpostponable — to put off to a later time; defer: He has postponed his departure until tomorrow.
- unspontaneous — coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned: a spontaneous burst of applause.