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sulphuric acid |
Noun
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a highly corrosive acid made from sulfur dioxide |
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sphalerite |
Noun
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an ore that is the chief source of zinc |
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summer |
Noun
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the period of finest development, happiness, or beauty |
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summer |
Noun
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the warmest season of the year |
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summer |
Verb
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spend the summer |
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second childhood |
Noun
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mental infirmity as a consequence of old age |
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solar day |
Noun
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time for Earth to make a complete rotation on its axis |
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schooldays |
Noun
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the time of life when you are going to school |
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schooltime |
Noun
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the time of life when you are going to school |
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schooltime |
Noun
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the period of instruction in a school |
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slow time scale |
Noun
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(simulation) the time scale used in data processing when the time-scale factor is greater than one |
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sell-by date |
Noun
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a date stamped on perishable produce indicating the date by which it should be sold |
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sixties |
Noun
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the time of life between 60 and 70 |
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sixties |
Noun
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the decade from 1960 to 1969 |
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seventies |
Noun
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the time of life between 70 and 80 |
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seventies |
Noun
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the decade from 1970 to 1979 |
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sabbatical leave |
Noun
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a leave usually taken every seventh year |
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sabbatical year |
Noun
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a sabbatical leave lasting one year |
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shore leave |
Noun
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leave granted to a sailor or naval officer |
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sick leave |
Noun
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a leave of absence from work because of illness |
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salad days |
Noun
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the best time of youth |
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spacecraft event time |
Noun
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the coordinated universal time on board the spacecraft |
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shelf life |
Noun
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the length of time a packaged food or drug will last without deteriorating |
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spacecraft clock time |
Noun
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the clock time given by a clock carried on board a spacecraft |
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suppertime |
Noun
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the customary or habitual hour for the evening meal |
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solar calendar |
Noun
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a calendar based on solar cycles |
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small hours |
Noun
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the hours just after midnight |
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sunup |
Noun
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the first light of day |
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sundown |
Noun
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the time in the evening at which the sun begins to fall below the horizon |
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saint's day |
Noun
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a day commemorating a saint |
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solstice |
Noun
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either of the two times of the year when the sun is at its greatest distance from the celestial equator |
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summer solstice |
Noun
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the date at which the sun is at its northernmost point, usually around the middle of summer |
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solar year |
Noun
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the time for the earth to make one revolution around the sun, measured between two vernal equinoxes |
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speech day |
Noun
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an annual day in the schools when speeches are made and prizes are distributed |
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school day |
Noun
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the period of instruction in a school |
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school day |
Noun
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any day on which school is in session |
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school year |
Noun
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the period of time each year when the school is open and people are studying |
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semester |
Noun
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half a year |
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semester |
Noun
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one of two divisions of an academic year |
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school term |
Noun
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the time during which a school holds classes |
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synodic month |
Noun
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the period between successive new moons (29.531 days) |
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sidereal time |
Noun
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measured by the diurnal motion of stars |
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sidereal day |
Noun
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the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day |
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sidereal year |
Noun
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the time for the earth to make one complete revolution around the sun, relative to the fixed stars |
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sidereal hour |
Noun
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1/24 of a sidereal day |
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sidereal month |
Noun
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period between successive conjunctions with a star, 27.322 days |
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solar month |
Noun
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one-twelfth of a solar or tropical year |
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split run |
Noun
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a print run of a newspaper during which some articles or advertisements are changed to produce a different edition |
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space age |
Noun
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the age beginning with the first space travel |
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split second |
Noun
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a very short time (as the time it takes the eye to blink or the heart to beat) |