15-letter words containing s, i, l, t, y
- tricotyledonous — having three cotyledons.
- turk's-cap lily — either of two lilies, Lilum martagon or L. superbum, having nodding flowers with the perianth segments rolled backward.
- tutorial system — a system of education, especially in some colleges, in which instruction is given personally by tutors, who also act as general advisers of a small group of students in their charge.
- tyrwhitt-wilson — Gerald Hugh, 14th Baron Berners [bur-nerz] /ˈbɜr nərz/ (Show IPA), 1883–1950, English composer, painter, and author.
- ultramicroscopy — the use of the ultramicroscope.
- un-fortuitously — happening or produced by chance; accidental: a fortuitous encounter.
- unaesthetically — offensive to the aesthetic sense; lacking in beauty or sensory appeal; unpleasant, as an object, design, arrangement, etc.: an unaesthetic combination of colors.
- unanswerability — the quality of not being answerable or contestable
- unapostolically — in an unapostalic manner
- uncomplaisantly — in an uncomplaisant manner
- unconstrainedly — in an unconfined manner
- understandingly — mental process of a person who comprehends; comprehension; personal interpretation: My understanding of the word does not agree with yours.
- uninterestingly — in a way that is not interesting
- unpretentiously — without pretension
- unquestioningly — in manner that accepts something without expressing doubt or uncertainty
- unrealistically — interested in, concerned with, or based on what is real or practical: a realistic estimate of costs; a realistic planner.
- unsarcastically — of, relating to, or characterized by sarcasm: a sarcastic reply.
- untrustworthily — in an untrustworthy manner; not trustworthily
- valentine's day — February 14, observed in honor of St. Valentine as a day for the exchange of valentines and other tokens of affection.
- vector analysis — the branch of calculus that deals with vectors and processes involving vectors.
- violinistically — in a violinistic manner
- visual literacy — the ability to apprehend or interpret pictures or other visual images.
- voyeuristically — of, relating to, or characteristic of a voyeur or of voyeurism.
- washington lily — a lily, Lilium washingtonianum, of the western coast of the U.S., having whorled leaves and fragrant, purple-spotted white flowers.
- wild strawberry — uncultivated plant bearing red fruit
- winter holidays — a period of rest from work or studies taken in winter
- 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).
- zoophysiologist — an expert in zoophysiology