General English

General Science

  • verb to direct something or someone


  • A device which serves to direct along a given course. Also, that which serves to indicate, or to regulate operation.
  • A material medium whose physical boundaries confine and direct propagating electromagnetic waves. A guide, for instance, may be a hollow metallic conductor, a coaxial cable, a fiber-optic cable, or an atmospheric duct. Guides enable propagation of electromagnetic waves with very little attenuation. Also called waveguide (1).
  • A guide (2) consisting of a hollow metal tube, and which is utilized primarily for propagating microwave energy. The cross section of such a tube may have any of various shapes, the most common being rectangular, circular, and elliptical. The waves are propagated along the longitudinal axis. Also called waveguide (2).

Information & Library Science

  • noun a book of instructions
  • noun a person who shows people the way

Media Studies

  • noun a publication that gives basic information or instructions on a subject


  • verb to advise someone how to carry out a task


  • noun somebody who shows tourists round a site or house

Origin & History of “guide”

The ancestor of guide was Germanic *wit-‘know’, source of English wise, wit, and witness. From it was derived a verb *wītan, and the Franks, a west Germanic people who conquered Gaul in the 3rd and 4th centuries ad, brought it with them. It eventually became Old French guider, and was borrowed by English. The semantic progression from ‘knowing’ to ‘showing’ is also displayed in the related German weisen ‘show, direct, indicate’.