15-letter words containing o, s, e, t, i, a
- white snakeroot — a North American plant, Eupatorium urticaefolium, the roots or rhizomes of which have been used as a remedy for snakebite
- winter holidays — a period of rest from work or studies taken in winter
- witch of agnesi — a plane curve symmetrical about the y- axis and asymptotic to the x- axis, given by the equation x 2 y =4 a 2 (2 a − y).
- wolverine state — Michigan (used as a nickname).
- worcester china — porcelain articles made in Worcester (England) from 1751 in a factory that became, in 1862, the Royal Worcester Porcelain Company
- working storage — the amount of memory used to temporarily store results or other data while a program is running.
- yeast infection — candida: genital inflammation
- yellow goatfish — a schooling goatfish, Mulloidichthys martinicus, inhabiting the Atlantic Ocean from Florida to Panama.
- yosemite valley — a glacial valley in Yosemite National Park in central California, in the Sierra Nevada Mountains. It has an altitude of about 1200 m (4000 ft), with sheer walls rising about another 1200 m (4000 ft).