heliotropism

Definitions

  • WordNet 3.6
    • n heliotropism an orienting response to the sun
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Webster's Revised Unabridged Dictionary
    • n Heliotropism (Bot) The phenomenon of turning toward the light, seen in many leaves and flowers.
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Century Dictionary and Cyclopedia
    • n heliotropism In botany, the tendency of growing organs to bend toward or in some cases away from the light, due in the former case to the retarding influence exerted by the light upon their growth on the side of the highest illumination. Thus the stems of plants that are grown in a window, or under other conditions in which light falls laterally upon them, curve toward the light; and if their position is reversed, they soon turn again toward the side of greatest illumination. The leaves arrange themselves so that the rays of light fall as nearly as possible perpendicularly upon their upper surfaces, and the stem curves so as to direct its apex toward the sonrce of light. Organs which behave in this way are said to be affected by positive heliotropism or to be simply heliotropic. On the other hand, certain organs upon which light also falls laterally curve in an opposite direction—that is, the apex is turned away from the source of light. Organs exhibiting this kind of curvature are said to be negatively heliotropic or apheliotropic. This condition is most frequently observed in roots. A still further condition, which has been called transverse heliotropism by Frank and dia-heliotropism by Darwin, is the condition under which certain organs tend to place their long axes perpendicular to the direction of the incident rays. The precise action of light in producing these various modifications is not well understood, but, as the studies of Vines have shown, it is probably largely due to modifications of the turgescence of the growing cells. Also heliotropy.
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Chambers's Twentieth Century Dictionary
    • ns Heliotropism the tendency that the stem and leaves of a seedling plant have to bend towards, and the roots from, the light when placed in a transparent vessel of water within reach of the light of a window
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Etymology

Webster's Revised Unabridged Dictionary
Helio-, + Gr. to turn
Chambers's Twentieth Century Dictionary
Fr.,—L.,—Gr. hēliotropionhēlios, the sun, tropos, a turn.

Usage

In literature:

She seated herself before a green and heliotrope background that instantly took warmth from her colour.
"The Spenders" by Harry Leon Wilson
There were asters and mignonette, sweet-peas and convolvolus, heliotrope and fuchsias.
"Christie, the King's Servant" by Mrs. O. F. Walton
It is not a turn-sun or heliotrope at all.
"Character Sketches of Romance, Fiction and the Drama, Vol 1" by The Rev. E. Cobham Brewer, LL.D.
Oxen and heliotropes are both good, but not for one another.
"Summer on the Lakes, in 1843" by S.M. Fuller
She went to the ball in a simple white dress, wearing a bunch of heliotrope, the gift of her lover.
"The World's Greatest Books, Vol VIII" by Arthur Mee and J.A. Hammerton, Eds.
Greenish quartz, approaching to heliotrope.
"Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]" by Phillip Parker King
Zara was sitting upon the heliotrope Empire sofa and had picked up the paper again.
"The Reason Why" by Elinor Glyn
When my horse was brought to the door, she came to me with a delicate spray of heliotrope.
"Coralie" by Charlotte M. Braeme
Heliotrope, a San Francisco Idyll.
"The California Birthday Book" by Various
Her dress was a sort of pale heliotrope, with trimmings of a deeper shade, and in her hands she carried a big bunch of June roses.
"Vanguards of the Plains" by Margaret McCarter
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In poetry:

'Oh, were I a heliotrope,
I would play poet,
And blow a breeze of fragrance
To you; and none should know it.
"To J.M.B." by Louisa May Alcott
Eyes, talismanic heliotrope,
Beneath mesmeric lashes, where
The sorceries of love and hope
Had made a shining lair.
"The Garden Of Dreams" by Madison Julius Cawein
Who set their heart upon a hope
That never comes to pass,
Droop in the end like fading heliotrope
The sun's wan looking-glass.
"In The Willow Shade" by Christina Georgina Rossetti
This (need one dread? nay, dare one hope?)
Will rise, a ghost of memory, if
Ever again my handkerchief
Is scented with White Heliotrope.
"White Heliotrope" by Arthur Symons
How have they blossomed, see the sky is like a garden!
Ah! how fresh the worlds look hanging on the slope!
Pluck one and wear it, Love, and ask the Gardener's pardon,
Pluck out the Pleiads like a spray of heliotrope.
"The Lover To His Lass" by Duncan Campbell Scott
"Men," said the Admiral, "I abhor
To litter my boat with the shot and shell,
And it's very untidy to go to war
And scent my sails with the powder smell;
So load the cannon with scouring soap
And sachet powder of heliotrope."
"The Battle of Clothesline Bay" by Wallace Irwin

In news:

Heliotrope Architects and NBBJ Location: Orcasisland, Washington.
Enjoy the fragrances of Heliotrope and several other pungent annuals with Old Fashion Fragrance Collection.
Though it's hard to stand out among so much musical madness, that is exactly what the experimental music festival Heliotrope has done over the course of eight successful runs.
From the Department of One Man's Vandalism Is Another Man's Creative Expression comes Heliotrope's show Out on a Rail.
From the Department of One Man's Vandalism Is Another Man's Creative Expression comes Heliotrope's show Out on a Rail .
David Gibson's picturesque landscape paintings remain at Heliotrope through Labor Day, befor.
Heliotrope brings new local beauty products to light.
The Heliotrope boutique in Noe Valley.
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