21-letter words containing s, i, d, h
- purple-fringed orchis — either of two North American orchids (Habenaria psycodes and H. fimbriata) with purple-fringed flowers
- push up (the) daisies — to be dead and buried
- put in the hard yards — to make a great effort to achieve an end
- ralph roister doister — a play (1553?) by Nicholas Udall: the earliest known English comedy.
- rayleigh distribution — (mathematics) A curve that yields a good approximation to the actual labour curves on software projects.
- reading comprehension — a text that students use to help them improve their reading skills, by reading it and answering questions relating to the text. Sometimes used as a test or examination of reading skills. A reading comprehension can be in the student's own or another language
- ring-around-the-rosey — a children's game in which the players sing while going around in a circle and squat when the lyrics “all fall down” are sung.
- rutherford scattering — the scattering of an alpha particle through a large angle with respect to the original direction of motion of the particle, caused by an atom (Rutherford atom) with most of the mass and all of the positive electric charge concentrated at a center or nucleus.
- s-k reduction machine — An abstract machine defined by Professor David Turner to evaluate combinator expressions represented as binary graphs. Named after the two basic combinators, S and K.
- safe in the knowledge — If you do something safe in the knowledge that something else is the case, you do the first thing confidently because you are sure of the second thing.
- sail against the wind — to sail a course that slants slightly away from the true direction of the wind; sail closehauled
- satellite dish aerial — a parabolic aerial for reception from or transmission to an artificial satellite
- schema definition set — (SDS) Something in Portable Common Tool Environment.
- school of the soldier — an institution where instruction is given, especially to persons under college age: The children are at school.
- school superintendent — an official whose job is to oversee school administration within a district
- scorched earth policy — a military practice of devastating the property and agriculture of an area before abandoning it to an advancing enemy.
- scorched-earth policy — a military practice of devastating the property and agriculture of an area before abandoning it to an advancing enemy.
- sealed-beam headlight — a headlight in which the reflector and lens are hermetically sealed together with the filament in a single unit.
- set the world on fire — the earth or globe, considered as a planet.
- seventh day adventist — Seventh Day Adventist churches are churches that believe that Jesus Christ will return very soon, and that have Saturday as their holy day.
- seventh-day adventist — See example at Seventh-Day.
- shams ud-din mohammed — (Shams ud-din Mohammed) c1320–89? Persian poet.
- share and share alike — with each having an equal share
- sheppard's correction — a method of correcting the bias in standard deviations and higher moments of distributions that arises from grouping values of the variable.
- silicon tetrachloride — a colorless, fuming liquid, SiCl 4 , used chiefly for making smoke screens and various derivatives of silicon.
- slatwall merchandiser — A slatwall merchandiser is a three-dimensional display unit with grooves cut into its surface into which metal hanging rails can be fixed at various heights.
- snappy video snapshot — (hardware) (registered trademark) A frame grabber for the IBM PC designed and marketed by Play, Inc..
- snr bandwidth product — (communications) The integral of the SNR over frequency. The SNR bandwidth product is an important limit in the capacity of a communication channel.
- sodium metabisulphite — an inorganic compound with the chemical formula Na2S2O5 that is used as a preservative, antioxidant and disinfectant
- sovereign wealth fund — an investment fund created using the financial assets of a national government
- spherical coordinates — Usually, spherical coordinates. any of three coordinates used to locate a point in space by the length of its radius vector and the angles this vector makes with two perpendicular polar planes.
- spotted alfalfa aphid — a pale yellowish aphid, Therioaphis maculata, of the southern U.S., especially west of the Mississippi River, that is marked with black spots and has fine spines on its back: a pest mainly of alfalfa and some other legumes, as clover.
- staffordshire terrier — former name of American Staffordshire terrier.
- swim against the tide — to resist prevailing opinion
- synchronized shifting — gear shifting in which the gears to be meshed are made to rotate at the same speed.
- synchronized swimming — a sport growing out of water ballet in which swimmers, in solo, duet, and team efforts, complete various required figures by performing motions in relatively stationary positions, along with a freestyle competition, with the contestants synchronizing movements to music and being judged for body position, control, and the degree of difficulty of the moves.
- synchrotron radiation — electromagnetic radiation emitted by charged particles as they pass through magnetic fields.
- take sb at their word — If you take someone at their word, you believe what they say, when they did not really mean it or when they meant something slightly different.
- the antipodes islands — a group of small uninhabited islands in the South Pacific, southeast of and belonging to New Zealand. Area: 62 sq km (24 sq miles)
- the oldest profession — prostitution
- the stars and stripes — the national flag of the United States of America, consisting of 50 white stars representing the present states on a blue field and seven red and six white horizontal stripes representing the original states
- the student community — the body of students in further and higher education, considered as a whole
- thermal decomposition — Thermal decomposition is the process in which a chemical species breaks down when its temperature is increased.
- think outside the box — to think in a different, innovative, or original manner, esp with regard to business practices, products, systems, etc
- third-party insurance — insurance that compensates for a loss to a party other than the insured for which the insured is liable.
- threshold wage policy — a policy whereby wages are increased in accordance with inflation
- to be mixed up in sth — if you are mixed up in something, usually something bad, you are involved in it
- to blow sth wide open — to expose something
- to dig one's heels in — If you dig your heels in or dig in your heels, you refuse to do something such as change your opinions or plans, especially when someone is trying very hard to make you do so.
- to hit the bookstands — (of a book) to be published