from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having a tendency to move in response to light. An animal or microbe that is positively phototropic will move toward light. One that is negatively phototropic will move away from light.

from the GNU version of the Collaborative International Dictionary of English

  • adj. of or pertaining to phototropism; exhibiting phototropism; same as heliotropic.

from The Century Dictionary and Cyclopedia

  • Of, pertaining to, or exhibiting phototropism or phototropy.


Sorry, no etymologies found.


  • Shark Bay is notable for benthic 'living fossil' microbial communities, forming an expansive and wide variety of microbial mats, which are best developed in Hamelin Pool, giving the area the most significant assembly of phototropic microbial ecosystems in the world.

    Shark Bay, Australia

  • And the cats have taken to nesting* in the shade, whereas they are usually phototropic.

    No rain

  • Or that Missi, apparently forever content to hover in the shadow of the alluring Zezula, would spring for a phototropic hair weave that caused her coiffure to change color as well as pattern with every light shift?

    Trouble Magnet

  • Leaving her to the screen, Cardenas and Fourhorses quietly made their way back to the sitting area that faced the wide phototropic window.

    The Mocking Program

  • When it turned down an alley lit only by the diffuse glow from the remaining phototropic paint that covered the surrounding walls, the Inspector hesitated.

    The Mocking Program

  • His lightweight Striker slack strips rainbowed from deep purple to transparent according to how the light from the street struck the phototropic material.

    The Mocking Program

  • Attesting to the vitality of the Cocktale's business, there were three clerks: two women and one man, all clad in formal phototropic clothing that peekabooed strategically whenever they moved.

    The Mocking Program

  • A motor drove a wheeled platform, steered by a photoelectric unit that approached light sources by which the batteries might be recharged and, when this was done, became negatively phototropic and sought darkness.


  • All displayed windows formed of the same phototropic material as their goggles.


  • A glance forward showed the brilliant pulsing sun-ball of Circarpous Major, its devastating radiance stopped down to viewable intensity by the phototropic material of the transparent port itself.

    Splinter Of The Mind's Eye


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