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

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

They were thus placed because De Vries says* that they are apheliotropic when exposed to the light of the sun; but we could not perceive any effect from the above feeble degree of illumination.

From The Power of Movement in Plants by Darwin, Charles

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

Of the 54 cauterised radicles one case was doubtful, 25 curved themselves from the light in the normal manner, and 28, or more than half, were not in the least apheliotropic.

From The Power of Movement in Plants by Darwin, Charles