apheliotropic

[a-fee-lee-uh-trop-ik, -troh-pik, ap-hee-]

adjective

Botany.

1. turning or growing away from the sun.

apheliotropic

/ əˌfiː-, æpˌhiːlɪˈɒtrəˌpɪzəm, əˌfiː-, æpˌhiːlɪəˈtrɒpɪk /

adjective

1. biology growing in a direction away from the sunlight

Other Word Forms

• apheliotropism noun
• apheliotropically adverb

Word History and Origins

Origin of apheliotropic¹

First recorded in 1875–80; ap- ² + heliotropic

Word History and Origins

Origin of apheliotropic¹

C19: see _apo- , _heliotropic

Example Sentences

Apheliotropic, a-fē-li-o-trop′ik, adj. turning away from the sun.

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Any kind of movement in relation to light will obviously be much facilitated by each part circumnutating or bending successively in all directions, so that an already existing movement has only to be increased in some one direction, and to be lessened or stopped in the other directions, in order that it should become heliotropic, apheliotropic, etc., as the case may be.

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Sachs states that the older internodes of this Tropaeolum are apheliotropic; we therefore placed a plant, 11 3/4 inches high, in a box, blackened within, but open on one side in front of a north-east window without any blind.

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Bignonia capreolata: apheliotropic movement of a tendril, traced on a horizontal glass from 6.45 A.M.

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In the case of sleep-movements, the exciting or regulating cause is a difference in the intensity of the light, coming from above, at different periods of the twenty-four hours; whilst with heliotropic and apheliotropic movements, it is a difference in the intensity of the light on the two sides of the plant.

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