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symptom an indication or sign of something. [2 definitions]
symptomatology the field of medical science having to do with symptoms of disease. [2 definitions]
symptomless combined form of symptom.
syn. abbreviation of "synonym," a word having the same or nearly the same meaning as another word of the same language. [2 definitions]
syn- together; same.
synaesthesia variant of synesthesia.
synagogue a place used for worship and religious instruction by a Jewish congregation. [2 definitions]
synapse the point where nerve impulses are transmitted between the axon of one neuron and a dendrite or the cell body of another neuron.
synapsis in the early stage of meiosis, the side-by-side pairing of comparable male and female chromosomes. [2 definitions]
sync (informal) shortened form of "synchronization." [2 definitions]
synchrocyclotron a cyclotron in which frequency of voltage is regulated to accommodate the increases in mass of the particles as they reach high speeds.
synchromesh designating a gear-shifting mechanism that synchronizes the speeds of the two gears to be meshed, so that the transition is smooth.
synchronic of or pertaining to language features, social values, or the like at a given time without reference to past causes or examples. (Cf. diachronic.) [2 definitions]
synchronicity the fact or state of happening at the same time, esp. considered as a manifestation of intent or meaningfulness rather than chance or randomness.
synchronic linguistics the study of the structure of a language or languages at a specific point in time.
synchronism the condition of happening or existing at the same time; simultaneousness. [2 definitions]
synchronize to cause to occur, move, or operate at the same time or rate. [3 definitions]
synchronous of events, historical periods, and the like, occurring at the same time; simultaneous; contemporaneous. [3 definitions]
synchroscope an electronic instrument for finding the extent of synchronization between two or more similar moving devices, such as the engines of an airplane.
synchrotron a machine that uses a magnetic field in combination with an electrostatic field to accelerate charged particles to high energies.
synchrotron radiation electromagnetic radiation that is given off by high-energy particles as they are accelerated to nearly the speed of light in a magnetic field.