13-letter words containing t, o, p, a, l
- unpostponable — to put off to a later time; defer: He has postponed his departure until tomorrow.
- unproblematic — not problematic, not causing difficulties or confusion; uncomplicated
- unprotectable — to defend or guard from attack, invasion, loss, annoyance, insult, etc.; cover or shield from injury or danger.
- unputdownable — (especially of a book or periodical) so interesting or suspenseful as to compel reading.
- unsupportable — capable of being supported; endurable; maintainable.
- upland cotton — a plant, Gossypium hirsutum, of warm regions of the New World, that is the chief commercial cotton crop in the U.S.
- vale of tempe — a wooded valley in E Greece, in Thessaly between the mountains Olympus and Ossa
- wafflestomper — a shoe with a thick sole resembling a waffle
- walter piston — Walter, 1894–1976, U.S. composer.
- well-operated — to work, perform, or function, as a machine does: This engine does not operate properly.
- wolverhampton — a city in West Midlands, in W England.
- xerophthalmia — abnormal dryness of the eyeball characterized by conjunctivitis, caused by a deficiency of tears and attributed to a lack of vitamin A.
- xerophthalmic — Of or pertaining to xerophthalmia.
- xiphiplastron — the fourth lateral plate of a turtle's plastron
- zooplanktonic — Of or pertaining to zooplankton.