a ray of artificial ultraviolet light from a sunray lamp
sunray
Noun
herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head
sound pressure
Noun
the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point
specific heat
Noun
the heat required to raise the temperature of one gram of a substance one degree centigrade
sky wave
Noun
a radio wave that is reflected back to earth by the ionosphere or a communications satellite
sphacelus
Noun
the localized death of living cells (as from infection or the interruption of blood supply)
sphacelus
Noun
necrotic tissue
solar halo
Noun
a luminous halo parallel to the horizon at the altitude of the sun
sundog
Noun
a bright spot on the parhelic circle
sprites
Noun
atmospheric electricity (lasting 10 msec) appearing as globular flashes of red (pink to blood-red) light rising to heights of 60 miles (sometimes seen together with elves)
solar magnetic field
Noun
the magnetic field of the sun
sympathetic vibration
Noun
(physics) vibration produced by resonance
serendipity
Noun
good luck in making unexpected and fortunate discoveries
solar gravity
Noun
the gravity of the sun
sphagnum
Noun
any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
supertwister
Noun
the most powerful tornado which can create enormously devastating damage
sex linkage
Noun
an association between genes in sex chromosomes that makes some characteristics appear more frequently in one sex than in the other
sphagnum moss
Noun
any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
solar parallax
Noun
the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit
short wave
Noun
a radio wave with a wavelength less than 100 meters (a frequency greater than 3 megahertz)
surface tension
Noun
a phenomenon at the surface of a liquid caused by intermolecular forces
simoom
Noun
a violent hot sand-laden wind on the deserts of Arabia and North Africa
syzygy
Noun
the straight line configuration of 3 celestial bodies (as the sun and earth and moon) in a gravitational system
simoon
Noun
a violent hot sand-laden wind on the deserts of Arabia and North Africa
samiel
Noun
a violent hot sand-laden wind on the deserts of Arabia and North Africa
skin effect
Noun
the tendency of high-frequency alternating current to distribute near the surface of a conductor
sleet
Noun
partially melted snow (or a mixture of rain and snow)
sleet
Verb
precipitate as a mixture of rain and snow
semi-climber
Noun
a plant that tends to climb and on occasion can grow like a vine
smother
Noun
a stifling cloud of smoke
smother
Noun
a confused multitude of things
smother
Verb
conceal or hide
smother
Verb
envelop completely
smother
Verb
deprive of the oxygen necessary for combustion
smother
Verb
deprive of oxygen and prevent from breathing
smother
Verb
form an impenetrable cover over
snowfall
Noun
precipitation falling from clouds in the form of ice crystals
snow flurry
Noun
a light brief snowfall and gust of wind (or something resembling that)
snow mist
Noun
small crystals of ice
snowstorm
Noun
a storm with widespread snowfall accompanied by strong winds
solar energy
Noun
energy from the sun that is converted into thermal or electrical energy
streamline flow
Noun
flow of a gas or liquid in which the velocity at any point is relatively steady
solar power
Noun
energy from the sun that is converted into thermal or electrical energy
solar radiation
Noun
radiation from the sun
solar flare
Noun
a sudden eruption of intense high-energy radiation from the sun's surface
solar prominence
Noun
large eruptions of luminous hydrogen gas that rise thousands of kilometers above the chromosphere
solar wind
Noun
a stream of protons moving radially from the sun
sun-ray
Noun
a ray of artificial ultraviolet light from a sunray lamp
sound spectrum
Noun
the distribution of energy as a function of frequency for a particular sound source