19-letter words containing a, p, e, s, t
- waterglass painting — stereochromy.
- welsh mountain pony — a small sturdy but graceful breed of pony used mostly for riding, originally from Wales
- what possessed you? — If you ask what possessed someone to do something, you are emphasizing your great surprise that they have done something which you consider foolish or dangerous.
- whorfian hypothesis — Sapir-Whorf hypothesis.
- wireless telegraphy — Now Rare. radiotelegraphy.
- xenotransplantation — xenograft.