English
heliotropism
From helio- + -tropism.
A compound of helio- + -tropism
Proto-Indo-European *sóh₂wl̥ ‘sun’
Proto-Hellenic *hāwélios ‘sun’
Ancient Greek ἥλιος ‘sun’
English helio-
Today it means
noun The property of some plants of turning under the influence of light; either positively (towards the light) or negatively (away from the light).
Language periods are conventional ranges, not dates for this word.
Etymograph / heliotropism