Sir

noun

1. 1

   The titular prefix given to a knight or baronet.

2. 2

   informalA respectful term of address or reference to a man of higher rank or position before the man's given name or nickname.

3. 3

   Variant of sirAlternative letter-case form of sir.

   The family tree boasts an astonishing array of celebrated historical figures from the prophet Isaiah to Sir Isaiah Berlin, from Felix Mendelssohn to Karl Marx and Moses Montefiore. The list also includes Yehudi Menuhin, Helena Rubinstein, the Rothschilds and even Rosenstein himself.

proper noun

1. 1

   Variant of SyrAlternative form of Syr.

   The Kara-tau, or "Black Mountain," the last spur of the Tian-shan towards the north-west, seldom exceeds 6,500 feet in height, but is geographically of great importance, as forming the water-parting between the Sir and Chu basins. It also abounds most in coal, iron, copper, and argentiferous lead.

Forms

plural

Sirs