sirred / surd [sɜrd]
sirred – v. – simple past of sir – addressed a man as 'sir'
surd – adj., n. & v. – adj. – 1. Mathematics of a number or quantity (especially a root): that cannot be expressed in finite terms of ordinary numbers;2. senseless, irrational; n. – Mathematics an irrational number or quantity, especially a root; v. – 1. defile; 2. mute, deaden the sound