Definition of "helix" [he•lix]

• Mathematics A three-dimensional curve that lies on a cylinder or cone, so that its angle to a plane perpendicular to the axis is constant. (noun)
• A spiral form or structure. (noun)
• Anatomy The folded rim of skin and cartilage around most of the outer ear. (noun)
• Architecture A volute on a Corinthian or Ionic capital. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Even the double helix is a sort of spell-checker, for editorial enzymes can compare one DNA base with its opposite and undamaged number to check that it fits."
• "The double helix is then untwisted and forms two single strands which can be duplicated with the help of the enzyme DNA polymerase."
• "At these locations the DNA-helix is severed: the pages of the book are separated."