Surd
# Surd

Surd may refer to:

## Mathematics

* Surd (mathematics), an unresolved root or sum of roots
* Radical symbol, the notation for a root
* formerly, an irrational number in general

## Other uses

* Surd, Hungary
* Voiceless consonant, opposed to sonant
* Jeremiah Surd, a character on the television series The Real Adventures of Jonny Quest
