speed of sound.in dry air at a temperature of 32° F (0° C) is  1088 ft/second or 331.6 m/sec; when temperature increases, so does the speed of sound, for example at 68° F (20° C), the velocity of sound is 1129 ft/second (344 m/sec)

sickle cell anemia.noun
a chronic, usually fatal anemia marked by crescent-shaped red blood cells, occurring almost exclusively in Black people of Africa or of African descent and characterized by episodic pain in the joints, fever, leg ulcers and jaundice; the disease is caused by a recessive.gene; also called sickle cell disease

shrubbery.noun,.plural.shrubberies
a group or planting of shrubs
shrub.noun,.plural.shrubs
a woody plant of relatively low height, having several stems arising from the base and lacking a single trunk; a bush

shatter, shattered, shattering, shatters.verbs
transitive verb use.to cause to break or burst.suddenly into pieces, as with a violent.blow; (the clothes rack fell onto the table that was holding the extra dishes shattering a few of them); to damage.seriously; to cause the destruction or ruin of; destroy (the dog was not a good idea to take into the china shop as he shattered many dishes we had to pay for) 
intransitive verb use.to break into pieces; smash or burst; break
shatter.noun,.plural.shatters
the act of shattering; the condition of being shattered; a splintered or fragmented condition (a rare piece of porcelain now in shatters)
shatteringly.adverb

surge, surged, surging, surges.verbs
intransitive verb use.to move in a billowing or swelling.manner in or as if in waves; rise; to roll or be tossed about on waves, as a boat (surging about in the water); to move like advancing waves (the fans surged forward to see the movie star); to increase suddenly, used of electric current or voltage (those with computers and other expensice electronic equipment are wise to use a surge protector); nautical, to slip around a windlass, used of a rope
transitive verb use.nautically, to loosen or slacken a cable gradually
surge.noun,.plural.surges
a heavy, billowing or swelling motion like that of great waves; wave motion with low height and a shorter period than a swell; a coastal rise in water level caused by wind; a sudden onrush (a surge of joy hearing that our children arrived safely); a sudden, transient increase or oscillation in electric current or voltage; an instability in the power output of an engine; in astronomy, a brief.disturbance occurring during the eruption of a solar flare

software.noun,.plural.softwares
Computers:.the programs, routines and symbolic languages that control the functioning of the hardware and direct its operation, called code
software.attributive
often used to modify another noun (software manufacturers; software sales)

soft, softer, softest.adjectives
something that is soft is pleasant to touch and not rough or hard (regular use of an safe organic body lotion will keep the skin soft and supple; warm, soft, white towels); something that is soft changes shape or bends easily when you press it (she lay down on the soft, comfortable bed; be sure to add enough coconut milk to form a soft dough; soft cheese); something that has a soft appearance has smooth curves rather than sharp or distinct edges; something that is soft is very gentle and has no force, for example, a soft sound or voice is quiet and not harsh; (a soft light or colour is pleasant to look at because it is not bright); easily molded, cut or worked; yielding.readily to pressure or weight; smooth or fine to the touch (a soft fabric; not loud, harsh or irritating (a soft voice); not glaring; subdued (soft colors); not sharply drawn or delineated (soft charcoal shading); mild; balmy (warm with a soft breeze); of a gentle disposition; tender; affectionate (a soft glance); attracted or emotionally involved (he has been soft on her for years); not stern; lenient; gradually declining in trend; not firm (a soft market for new car sales; a soft computer market); easy (a soft job)
soft.noun
a soft object or part
soft.adverb
in a soft manner; gently
softly.adverb
softness.noun

soften, softened, softening, softens.verbs
transitive verb use.to make soft or softer; to undermine or reduce the strength or resistance of (they softened the hard clay before beginning to dig); to make less harsh, strident or critical (softened the last paragraph of the letter)
intransitive verb use.to become soft or softer
softener.noun,.plural.softeners

semitone.noun,.plural.semitones
in music, an interval equal to a half tone, which is what a semitone is, in the standard.diatonic.scale
semitonic.adjective
semitonically.adverb

subcutaneous.adjective
subcutaneous is used to indicate that something is situated, used or put under your skin (subcutaneous tissue; subcutaneous fat); see cutaneous
subcutaneously.adverb

sharp, sharper, sharpest.adjectives
a sharp point or edge is very thin and can cut through things very easily; a sharp knife, tool or other object has a point or edge of this kind (the other end of the twig is sharpened into a sharp point to use as a toothpick; using a sharp knife, cut away the pith and peel from both fruits); having a thin edge or a fine point suitable for or capable of cutting or piercing; having clear form and detail (she was keen and sharp in her speech covering all effective points for consideration; a sharp photographic image); terminating in an edge or a point (sharp, angular cliffs; a sharp nose); clearly and distinctly set forth (sharp contrasts from light to dark); abrupt or acute (a sharp drop; a sharp turn); intellectually.penetrating; astute; marked by keenness and accuracy of perception (sharp hearing); crafty or deceitful, as in corporate.dealings (sharp practices by governments and in courtrooms keeping information away from men and women {common law, fictional person as compared to man and woman, birth certificate realities and hundreds more}); vigilant; alert (kept a sharp lookout for shoplifters); briskly or keenly cold and cutting (a sharp wind); harsh or biting in tone or character (sharp criticism); fierce or impetuous; violent (a sharp temper); intense; severe (a sharp pain); sudden and shrill (a sharp whistle); sudden and brilliant or dazzling (a sharp flash of lightning); strongly affecting the senses of smell and taste (a sharp, pungent.odor; a sharp cheese); composed of hard, angular particles (sharp sand); attractive or stylish (a sharp jacket)
sharp.adverb
in a sharp manner (the golf ball hit sharp on the windshield); punctually; exactly (see you at three o'clock sharp)
sharply.adverb
sharpness.noun

sharpen, sharpened, sharpening, sharpens.intransitive and transitive verbs
to make or become sharp or sharper
sharpener.noun,.plural.sharpeners
(the substitute teacher asked the class who were those in charge of sharpening the pencils)

sharp.adverb
in music, above the true or proper pitch
sharp.noun,.plural.sharps
in music, a note or tone raised one semitone above its normal pitch; a sign (^) indicating this
sharp, sharped, sharping, sharps.verbs
Music:.transitive verb use.to raise in pitch by a semitone
intransitive verb use.to play or sing above the proper pitch

scratch, scratched, scratching, scratches.verbs
intransitive verb use.to make a thin, shallow cut or mark on (a surface) with a sharp instrument; to use the nails or claws to dig or scrape at; to rub or scrape the skin to relieve.itching; to scrape on an abrasive surface (bears scratch their itchy backs on trees); to write or draw something by scraping a surface (scratched their initials on a rock); to write or draw hurriedly (scratched off a thank-you note); to strike out or cancel a word, for example by drawing a line through it; to cancel a project or a program (scratched the plans for yet another road through the desert)
intransitive verb use.to use the nails or claws to dig or scrape; to rub or scrape the skin to relieve itching; to make a harsh, scraping sound (scratched the fingernails on the blackboard to make an eerie noise); to gather funds or produce a living with difficulty (early pioneers who were forced to scratch out a living because of corrupt government money policies redirecting prosperity away from all but a few selected interests)
scratch.noun,.plural.scratches
a mark resembling a line that is produced by scratching; a slight wound (scratched her arm on bushes as she walked through the brush); a hasty.scribble; a sound made by scratching; poultry feed (chicken scratch)
scratch.adjective
assembled hastily (scratched a party together after forgetting the birthday)
from scratch.idiom
from the very beginning (made a cake from scratch because she had all the ingredients on hand)
up to scratch.idiom
meeting the requirements (his qualificatons were up to scratch so he was hired); in fit condition
scratcher.noun,.plural.scratchers

spirant.noun,.plural.spirants
in linguistics, see fricative
spirant.adjective

Sephardi.noun,.plural.Sephardim
a descendant of the Jews who lived in Spain and Portugal during the Middle Ages until persecution.culminating in expulsion in 1492 forced them to leave; they were members of the occidental (western countries) branch of European Jews settling in France, Holland, England, Italy, the Levant (countries bordering on the eastern Mediterranean Sea from Turkey to Egypt), the Balkan states and the Americas. They differ from the Ashkenazi. Sepharad is the Hebrew name for Spain.
Sephardic.adjective