/
ˈhiːlɪətrəʊp, 
ˈhɛl-/
n.
 a plant of the borage family, cultivated for its fragrant purple or blue flowers. 
[Genus 
Heliotropium.]
Etymology
OE eliotropus (orig. applied to various plants whose flowers turn towards the sun), via L. from Gk hēliotropion, from hēlios ‘sun’ + trepein ‘to turn’.