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sural
Surat
surbase
surbased
surcease
surcharge
surcingle
surcoat
surd
sure
sure-fire
sure-footed
sure thing
surely
surety
surf
surf and turf
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surd

surd [ surd ] (plural surds)


noun 
Definition:
 
1. irrational root or number: in mathematics, an irrational root or irrational number, or an expression containing one or the other

2. voiceless sound: a consonant pronounced without vibration of the vocal cords

[Mid-16th century. < Latin surdus "unable to hear or speak"]
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