Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or situated in a plane.
  • adj. Flat: a planar surface.
  • adj. Having a two-dimensional characteristic.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or pertaining to a plane.
  • adj. Flat, two-dimensional.
  • adj. Able to be embedded in the plane with no edges intersecting.

from The Century Dictionary and Cyclopedia

  • Lying in a plane; planary; flat.
  • Of or pertaining to a plane.
  • n. See anastigmat.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. involving two dimensions

Etymologies

Late Latin plānāris, flat, from Latin plānus; see plain.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Late Latin planarius ("relating to a plane"), from planum ("plane"). (Wiktionary)

Examples

  • Contrary to earlier claims, we find that the amount of power concentrated in planar modes for $\ell = 2,3$ is not inconsistent with isotropy and Gaussianity.

    Science Press Release Synopses

  • The construction shows that the wavefronts remain planar.

    Optics basics: What is a wave? Part III: Diffraction « Skulls in the Stars

  • Wikipedia suggests: "Something is called planar if it is made up of flat planes, or pertaining to planes."

    HH Com 221 (217)

  • One of them was something called a planar transistor, created by Jean Hoerni,

    The Accidental Entrepreneur

  • The joint venture used a new cell structure called a planar cell that enabled more aggressive cell scaling than conventional architectures.

    Forbes.com: News

  • In doing so, they found that the Dishevelled genes activate a genetic pathway, called the planar cell polarity pathway, which helps determine positional information in cells and tissues.

    EurekAlert! - Breaking News

  • Advances in Planar Lipid Bilayers and Liposomes, Volume 8, continues to include invited chapters on a broad range of topics, covering both main arrangements of the reconstituted system, namely planar lipid bilayers and spherical liposomes.

    AvaxHome RSS:

  • Advances in Planar Lipid Bilayers and Liposomes, Volume 7, continues to include invited chapters on a broad range of topics, covering both main arrangements of the reconstituted system, namely planar lipid bilayers and spherical liposomes.

    AvaxHome RSS:

  • A better understanding of this phenomenon, called planar cell polarity, may also help scientists learn how improper cellular orientation can lead to spina bifida, polycystic kidney disease, and metastatic cancer.

    HHMI News

  • String formFactor: returns the form factor of the activity, e.g. "planar" for most desktop activities, "mediacenter" for media centers and either "horizontal" or

    KDE TechBase - Recent changes [en]

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