1. An irrational quantity, that is, a quantity or a number whose root cannot be exactly obtained, or cannot be expressed in rational numbers, such as 2, because there is no number which multiplied into itself will exactly produce it.

2. Not expressible in rational numbers.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sord,
• shard,
• churd,
• curd,
• seard,
• serd,
• shurd,
• zurd,
• eurd,
• syrd,
• sjrd,
• s8rd,
• s7rd,
• sufd,
• su5d,
• su4d,
• surx,
• saurd,
• seurd,
• suurd

• surrett,
• surratt.

The adjective form of the word "surd" is "surdic".

The plural of the "surd" can be the "surds".

The singular of the "surd" can be the "surd".