Surd

Look up surd in Wiktionary, the free dictionary.

Surd may be:

• A voiceless consonant
• Surd, Hungary, a village in Zala county, Hungary

• Surd evil is another term for Natural evil, a type of random and unexplainable evil without meaning
• Jeremiah Surd is a quadriplegic hacker and antagonist from the television series The Real Adventures of Jonny Quest
• A Sikh (colloquial and possibly derogatory)

Mathematics

• An irrational nth root or a sum of nth roots
• Formerly, an irrational number in general