13-letter words containing p, o, r, e, l, a
- tropical year — year (def 4b).
- tropical zone — Torrid Zone
- tropocollagen — the molecular unit which forms collagen, consisting of three polypeptide chains
- ultrapowerful — extremely powerful
- un-personable — of pleasing personal appearance; handsome or comely; attractive.
- unexplanatory — serving to explain: an explanatory footnote.
- unperformable — to carry out; execute; do: to perform miracles.
- unpolarizable — not capable of being polarized
- 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.
- unreproachful — not deserving reproach or blame
- unsupportable — capable of being supported; endurable; maintainable.
- upland plover — a large, field-inhabiting sandpiper, Bartramia longicauda, of eastern North America, resembling a plover: now protected and increasing in numbers.
- 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.
- yellow poplar — tulip tree (def 1).
- york imperial — an American variety of yellow or green apple with red stripes.