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

It appears, therefore, that light does not determine the growth of apheliotropic parts in any uniform manner.

From The Power of Movement in Plants by Darwin, Charles

The stems of very young plants of Tropaeolum majus are highly heliotropic, whilst those of older plants, according to Sachs, are slightly apheliotropic.

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

This is the case with the radicles of Sinapis alba, which are plainly apheliotropic; nevertheless, they grow quicker in darkness than in light.*

From The Power of Movement in Plants by Darwin, Charles