21-letter words containing o, n, l, y
- schlieren photography — a type of photography which records schlieren
- seventeen-year locust — a cicada, Magicicada septendecim, of the eastern U.S., having nymphs that live in the soil, usually emerging in great numbers after 17 years in the North or 13 years in the South.
- social inquiry report — (in Britain) a report on a person and his or her circumstances, which may be required by a court before sentencing and is made by a probation officer or a social worker from a local authority social services department
- statutory declaration — a declaration made under statutory authority before a justice of the peace or commissioner for oaths which may in certain cases be substituted for a statement on oath
- sunday school teacher — someone who teaches at a Sunday school
- supply-side economics — a school of economic thought that emphasizes the importance to a strong economy of policies that remove impediments to supply
- systeme international — Système International d'Unités
- tartarian honeysuckle — an Asian honeysuckle, Lonicera tatarica, having fragrant, white to pink flowers.
- the women's land army — a unit of women recruited to do agricultural work in the United Kingdom during World War I and World War II
- to fly in the face of — If an action or belief flies in the face of accepted ideas or rules, it seems to completely oppose or contradict them.
- to fly off the handle — If you fly off the handle, you suddenly and completely lose your temper.
- to lay down your life — If someone lays down their life for another person, they die so that the other person can live.
- to lay something bare — If you lay something bare, you uncover it completely so that it can then be seen.
- to let your hair down — If you let your hair down, you relax completely and enjoy yourself.
- to play second fiddle — If you play second fiddle to someone, your position is less important than theirs in something that you are doing together.
- twenty-two metre line — one of two lines on a rugby pitch which are twenty-two metres from the goal-line
- ulster unionist party — a Northern Irish political party advocating the maintenance of union with the UK
- ultraviolet astronomy — the branch of astronomy that deals with celestial objects emitting electromagnetic radiation in the ultraviolet range.
- university of iceland — (body, education) The Home of Fjolnir.
- ventriloquist's dummy — a puppet which is operated by a ventriloquist and made to appear to talk
- voice-stress analyzer — a machine purported to detect stress in a human voice and to ascertain a person's truthfulness.
- volumetric efficiency — the ratio of fluid delivered by a piston or ram pump per stroke to the displacement volume of the piston or ram
- voluntary arrangement — a procedure enabling an insolvent company to come to an arrangement with its creditors and resolve its financial problems, often in compliance with a court order
- voluntary association — a group of individuals joined together on the basis of mutual interest or common objectives, especially a business group that is not organized or constituted as a legal entity.
- voluntary liquidation — the process of voluntarily terminating the affairs of a business, firm, etc, by realizing its assets to discharge its liabilities or the state of a business firm, etc, having its affairs so terminated
- weinberg-salam theory — electroweak theory.