Webster's English Dictionary

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surd

1. surd \'s*rd\ aj [L surdus deaf, silent, stupid; akin to L susurrus hum - 
   more at]SWARM 1: IRRATIONAL  2: VOICELESS - used of speech sounds 
2. surd n 1a: an irrational root (as <radical>3)  1b: IRRATIONAL  2: a surd 
   speech sound