Definitions
from The Century Dictionary.
- noun In botany, the so-called diurnal sleep of leaves: a modification of diaheliotropism. See the quotation under paraheliotropic.
Etymologies
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Examples
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I have thought that you would not object to my giving precedence to paraheliotropism, which has been so little noticed.
More Letters of Charles Darwin — Volume 2 Charles Darwin 1845
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I have been very much interested by your new facts on paraheliotropism, as I think that they justify my giving a name to this kind of movement, about which I long doubted.
More Letters of Charles Darwin — Volume 2 Charles Darwin 1845
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Like those of some Cassiae its leaves take an almost perfectly vertical position, when at noon, on a summer day, the sun is nearly in the zenith; but I doubt whether this paraheliotropism will be observable in England.
More Letters of Charles Darwin — Volume 2 Charles Darwin 1845
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It is curious that a hybrid Hedychium in my garden shows scarcely any trace of this paraheliotropism, while both the parent species are very paraheliotropic.
More Letters of Charles Darwin — Volume 2 Charles Darwin 1845
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I was particularly glad to hear of the strongly marked cases of paraheliotropism.
More Letters of Charles Darwin — Volume 2 Charles Darwin 1845
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