1. Produced without vibration of the vocal cords
   "surd consonants such as 'p' and 'k' and 's'";
   - unvoiced, voiceless, hard

1. A consonant produced without sound from the vocal cords
   "The 'p' sound in 'pat' is a surd";
   - voiceless consonant
    
2. (mathematics) an irrational number; the root symbol
   "The square root of 2 is an example of a surd"

Derived forms: surds

See also: whispered

Type of: consonant

Antonym: soft

Encyclopedia: Surd, Hungary