16-letter words containing s, e, p, i, o
- torsion pendulum — a pendulum the weight of which is rotated alternately in opposite directions through a horizontal plane by the torsion of the suspending rod or spring: used for clocks intended to run a long time between windings.
- transpeptidation — the process of transferring an amino acid or group of amino acids from one compound to another.
- transport police — the national police force for railways in Britain, which protects rail operators, staff and passengers
- trap-door spider — any of several burrowing spiders, of the family Ctenizidae, that construct a tubular nest with a hinged lid.
- trial separation — an experimental period of living apart
- triple-expansion — noting a power source, especially a steam engine, using the same fluid at three successive stages of expansion to do work in three or more cylinders.
- turn upside down — invert
- two-tailed pasha — a distinctive vanessid butterfly of S Europe, Charaxes jasius, having mottled brown wings with a yellow-orange margin and frilled hind edges
- unaccomplishable — to bring to its goal or conclusion; carry out; perform; finish: to accomplish one's mission.
- uncinate process — a curved, bony process on certain ribs of birds that projects backward and overlaps the succeeding rib, serving to strengthen the thorax.
- uncomprehensible — capable of being comprehended or understood; intelligible.
- underconsumption — the act of consuming, as by use, decay, or destruction.
- unimpressionable — easily impressed or influenced; susceptible: an impressionable youngster.
- union membership — members of a trade union
- united provinces — (used with a singular or plural verb) former name of Uttar Pradesh.
- unpublished work — a literary work that has not been reproduced for sale or publicly distributed.
- unresponsiveness — responding especially readily and sympathetically to appeals, efforts, influences, etc.: a responsive government.
- upside-down cake — a cake that is baked on a layer of fruit, then turned before serving so that the fruit is on top.
- upsilon particle — the 20th letter of the Greek alphabet (Υ, υ).
- verneuil process — a process for making synthetic rubies, sapphires, spinels, etc., by the fusion at high temperatures of powdered compounds.
- videodisc player — an electronic device for playing videodiscs through a television set.
- will-o'-the-wisp — ignis fatuus (def 1).
- windowpane shell — capiz.
- work-in-progress — In book-keeping, work-in-progress refers to the monetary value of work that has not yet been paid for because it has not yet been completed.
- world exposition — world's fair.
- writ of subpoena — a legal document commanding the attendance in court, as a witness, of the person on whom it is served, under a penalty
- zenith telescope — a telescope mounted to point only at the zenith, used at some observatories for measuring time by the stars.