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synthetic fuel a hydrocarbon fuel produced from fossil fuels such as shale, tar sands, or coal.
synthetic resin any of numerous resinous substances formed by the condensing or polymerizing of simpler molecules. [2 definitions]
syphilis a bacterial disease that can be transmitted between sexual partners or to an infant during childbirth, causing a latent infection that can affect any organ of the body or result in paralysis or insanity.
syphon variant of siphon.
Syria a Middle East country on the Mediterranean Sea between Turkey and Jordan.
Syriac a former Aramaic language now used liturgically in some eastern Christian churches.
syringa any of various ornamental shrubs or low trees, including the lilacs, that bear fragrant white, purple, or pink flowers shaped in a cylindrical tube. [2 definitions]
syringe a small tube, usu. fitted with a piston or bulb, for drawing in a quantity of fluid and pumping it through a small aperture or ejecting it in a stream. [3 definitions]
syrinx the vocal organ of birds, consisting of a thin vibrating muscle usu. located at or near the point where the trachea divides into the bronchi. [2 definitions]
syrup a solution of sugar in water, esp. a viscous solution containing flavoring or medication. [2 definitions]
syrupy having the sweetness or consistency of syrup. [2 definitions]
sys- together.
systaltic characterized by an alternating expansion and contraction, as the muscular activity of the heart; pulsating.
system a group of related things or parts that function together as a whole. [5 definitions]
systematic involving or based on a method or plan; not random or chaotic. [2 definitions]
systematize to organize into or according to a system; cause to be ordered or systematic.
systemic affecting the entire body. [3 definitions]
systemize to systematize.
systemless combined form of system.
systems analysis the quantitative study and analysis of an operation or activity to decide how its purposes and objectives can best be achieved. [2 definitions]
systems engineering a branch of engineering that makes use of computer science and systems analysis to put together efficient operating procedures for certain networks or complexes.