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sonic barrier the large increase in aerodynamic resistance experienced by aircraft approaching the speed of sound; sound barrier.
sonic boom an explosive sound caused by the shock wave preceding an aircraft traveling faster than sound.
sonic depth finder an instrument that uses sonar to measure underwater depths.
son-in-law the husband of one's daughter.
sonless combined form of son.
sonnet a fourteen-line poem that usu. rhymes, often in accordance with one or another of certain traditional patterns.
sonneteer one who writes sonnets. [3 definitions]
sonny small boy or little son (often used to address any young boy).
sonobuoy a buoy that receives and amplifies underwater sound signals and transmits them by radio.
son of a bitch (slang, often vulgar) a hateful or despicable person or thing. [2 definitions]
Son of God Jesus Christ.
sonogram a visual representation of sound waves, esp. those reflected in an ultrasound examination.
Sonoran Desert an arid region of the American southwest and northwestern Mexico.
sonorant a voiced consonant regarded as a syllabic sound, as "l," "r," "w," or "y".
sonority the condition or quality of resonating or being sonorous.
sonorous having, producing, or being a loud, deep, or full sound; resonant. [3 definitions]
soon in a short time; shortly. [3 definitions]
sooner or later at some time in the future.
soot a fine black powder produced during burning, which collects on the insides of chimneys or is carried into the air in smoke. [2 definitions]
sooth truth; reality.
soothe to make less angry, pained, distressed, or the like; calm or comfort. [3 definitions]