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sinuous
sinus
Sinus Iridum
sinus node
sinus venosus
sinusitis
sinusoid
sinusoidal projection
Siouan
Sioux
Sioux City
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sir

sir [ stressed sur, unstressed sər ] (plural sirs)


noun 
Definition:
 
1. polite form of address to man: a form of address to a man often used in speech as a sign of respect
Excuse me, sir, do you know what time it is?

2. U.K. way to address man teacher: a form of address to a man teacher, mainly used by his students

[13th century. Variant of sire]

yes or no sir used to emphasize emphatic confirmation or denial of something

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