apheliotropic

American  

[a-fee-lee-uh-trop-ik, -troh-pik, ap-hee-] / æˌfi li əˈtrɒp ɪk, -ˈtroʊ pɪk, æpˌhi- /

adjective

Botany.

1. turning or growing away from the sun.

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apheliotropic British  

/ əˌfiː-, æpˌhiːlɪˈɒtrəˌpɪzəm, əˌfiː-, æpˌhiːlɪəˈtrɒpɪk /

adjective

1. biology growing in a direction away from the sunlight

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Other Word Forms

• apheliotropically adverb
• apheliotropism noun

Etymology

Origin of apheliotropic

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

Example Sentences

Dahlia, circumnutation of young leaves, 244-246 Dalea alopecuroides, leaflets depressed at night, 354 Darkness, effect of, on the movement of leaves, 407 Darlingtonia Californica, its leaves or pitchers apheliotropic, 450, n.

From The Power of Movement in Plants by Darwin, Charles

The radicles of Sinapis alba, when immersed in water and exposed to a lateral light, bend from it, or are apheliotropic.

From The Power of Movement in Plants by Darwin, Charles

The sub-aërial roots observed by Wiesner were all apheliotropic, and this, no doubt, is of use in bringing them into contact with trunks of trees or surfaces of rock, as is their habit.

From The Power of Movement in Plants by Darwin, Charles

Both tracings showed that the apheliotropic movement was a modified form of circumnutation.

From The Power of Movement in Plants by Darwin, Charles

Some tendrils which consist of modified leaves—organs in all ordinary cases strongly diaheliotropic—have been rendered apheliotropic, and their tips crawl into any dark crevice.

From The Power of Movement in Plants by Darwin, Charles